Select the correct answer. In the absence of friction, gravity, and all other external forces, what kind of speed will an object display if it travels from the bottom to the top of an inclined plane

The sentence is true. When providing transcutaneous pacing, the appearance of wide QRS complexes and tall, broad T waves after each pacing spike confirms that mechanical capture has been achieved.

Transcutaneous pacing is a method of providing cardiac pacing by delivering electrical impulses through the skin to the heart. When mechanical capture is achieved, it means that the electrical impulse is strong enough to cause the heart muscle to contract.

This is confirmed by the appearance of wide QRS complexes and tall, broad T waves on an electrocardiogram (ECG) after each pacing spike. The QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization.

Wider QRS complex and taller T waves indicate that the electrical impulse is strong enough to depolarize the entire ventricular muscle, resulting in a stronger mechanical contraction.

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Your bulk and weight would be different on a different planet compared to how they are on Earth.

The correct option is A.

This was the most basic characteristic of matter and is one of the essential building blocks of physics. The term "mass" refers to a body's total amount of matter. The kilo is the SI unit of mass (kg). A body's bulk remains constant throughout time.

Scientists frequently use balances to quantify mass. Using an electronic balance or a beam balance, one may directly determine the mass of solids. A liquid's mass may be calculated by measuring its volume and using the density table to determine the liquid's density. The kg is the SI mass unit (Kg).

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The complete question is -

Compared to their values on Earth, on another planet your

(a) mass and weight would both be the same.

(b) mass would be the same but your weight would be different.

(c) weight would be the same but your mass would be different.

The new potential energy will be u/3. The energy that an item holds due of its position in relation to other objects, internal tensions, electric charge, or other reasons is known as potential energy.

When the two charges in a system are in opposition to one another—that is, when one charge is negative and the other is positive—the potential energy of the system is negative; it is positive when the charges are equal.

The square of the distance between the charges has an inverse relationship with the potential energy. Additionally, it depends on whether the two charges have the same sign or the opposite sign; if they do, potential energy will decrease; if they have the opposite sign, it will grow.

Two charges' potential energy increases as you get them closer, whether they are two positive or two negative charges. This requires positive work on the system. Potential energy increases when r decreases between two positive or two negative charges since it is proportional to 1/r.

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The magnitude of the electric force that the water molecule exerts on the chlorine ion is  F = 1.60x10^-19C × 6.17x10^-30C.m / (3.00x10^-9m)^2 = 1.65x10^-48N.

What is magnitude ?

The magnitude of the electric force that the water molecule exerts on the chlorine ion is 1.65x10^-48N.

The direction of the electric force is in the +x direction, away from the chlorine ion.

The force is repulsive

Magnitude is a measure of the size or intensity of something. It is typically used to refer to physical quantities such as mass, force, speed, distance, or energy, but can also refer to abstract concepts like loudness, brightness, or importance. Magnitude is typically expressed on a logarithmic scale, such as the Richter scale for earthquakes or the decibel scale for sound. The magnitude of a physical quantity is often indicated by a unit of measurement, such as kilograms, newtons, miles per hour, or candelas.

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A) To find the distance a sound wave travels in a certain time, we can use the formula:

distance = speed x time

Given that the speed of sound is 343 m/s and the time is 3000 microseconds, we can calculate the distance as:

distance = 343 m/s x (3000 x 10^-6 s) = 1.029 m

converting this to cm we get:

distance = 1.029 m x 100 cm/m = 102.9 cm

B) To find the time it takes for a sound wave to travel a certain distance, we can use the formula:

time = distance/speed

Given that the distance is 30 cm and the speed of sound is 343 m/s, we can calculate the time as:

time = 30 cm / 343 m/s = 0.00087 s

converting this to microseconds we get:

time = 0.00087 s * 10^6 microseconds/s = 87 microseconds

C) The time it takes for the sound wave to travel to the object and back is twice the time it takes for the sound wave to travel to the object alone. Given that the distance is 50 cm and the speed of sound is 343 m/s, we can calculate the time as:

time = 2 * (50 cm / 343 m/s) = 2 * 0.000146 s = 0.000292 s

converting this to microseconds we get:

time = 0.000292 s * 10^6 microseconds/s = 292 microseconds

So it takes 292 microseconds for a sound wave generated to bounce and gets back from an object 50 cm away.

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In the seat of a vehicle that transports passengers around a circular circle at an amusement park is a specific electronic sensor. The sensor calculates.

What do you mean by electronics?

Definition. To control the flow of electric impulses again for purposes of processing information and system control, electronic devices are necessary. The two most notable examples are transistors and diodes. Integrated circuits are compact packages that may hold numerous electronic devices that are typically small in size.

Why is technology employed today?

Through the usage of personal computers and mobile phones, it improved people's lives and shortened the distances between different countries. It improved discussion and opened up access to languages, some of which depended on translation features, while also facilitating communication between people, communities, and nations.

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it will take the cheetah 1.118 seconds to move at 25.0 mph.

Kinematic equations are mathematical equations used in physics to describe the motion of objects. These equations are used to solve problems involving velocity, acceleration, and displacement. The equations rely on the use of Newton's laws of motion, which state that the acceleration of an object is equal to the sum of all the forces acting upon it, divided by its mass.

First let's convert 25.0 mph to m/s:
25 mph = 11.176 m/s
Now we can use the kinematic equation for uniform acceleration:
vf = vi + at
where vf is the final velocity, vi is the initial velocity (which is 0 m/s since the cheetah is starting from rest), a is acceleration (10.0 m/s2), and t is the time interval.
11.176 = 0 + (10.0)(t)
t = 1.118 seconds
Therefore, it will take the cheetah 1.118 seconds to move at 25.0 mph.

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Answer:

1. Pulley System - Pulleys can be used to effectively transfer force, change the direction of a force and/or increase the power of a force. This can be used to teach the students how basic machines can be used to help in everyday life.

2. Lever System - Levers can be used to teach students about how their daily tasks can be made easier using a machine. It also helps illustrate the law of the lever.

3. Wheel and Axle - This machine allows students to learn how a wheel and axle can increase the torque or rotational force on an object thus allowing heavy loads to be moved with less effort.

4. Inclined Plane - This machine teaches students about how even large objects can be moved with a ramp as its sloped shape reduces the force needed to move objects.

5. Screw -The screw allows students to learn how force is transferred from one point to another. It also introduces them to concepts such as rotational force and torque.

The circumference of a circle of radius 17 mm is 34π or 34 × 3.14 = 106.76 mm.

The length of a circular or other curved geometrical object is referred to as its circumference. It is the edge of a surface like this with two dimensions, calculated linear in one dimension. A circle's circumference, which is equivalent to the length of it's own edge measured in linear distance, serves as a measure of length. In order to measure the circumference of a circle in the metric system, a most common units are millimetre, centimeter, and meter, but in the imperial system, the most common units include inch, foot, and yard.

Given :

Radius of circle = 17mm

By using the formula of circumference -

circumference = 2 × π × r

circumference = 2 × π × 17

circumference = 34 π

or 34 × 3.14 = 106.76 mm

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Answer:

Speed of Sound = 1234.9 kilometers per hour

Explanation:

Depends strongly on temperature and medium; the above answer assumes that the sound wave is propagating through an elastic medium at 20° C (68° F)

A temperature of 100 degrees Fahrenheit is equivalent to 37.78 degrees Celsius.

The conversion formula between Fahrenheit and Celsius is as follows:

°C = (°F - 32) x (5÷9)

So, to convert 100 degrees Fahrenheit to degrees Celsius, we can plug in 100 for °F and solve for °C:

°C = (100 - 32) x (5÷9) = 68 x (5÷9) = 37.78

It is important to note that the degree unit size (Fahrenheit and Celsius) is not the same, and thus the numerical value of the temperature measured in those scales does not match one to one. The freezing point of water is 32 degrees Fahrenheit (0 degrees Celsius) and the boiling point is 212 degrees Fahrenheit (100 degrees Celsius). This means that 100 degrees Fahrenheit is considered a "hot" temperature, but 37.78 degrees Celsius is considered a "normal" room temperature.

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Following are the different values asked in the question-

The kinetic energy of the two-skater system is 8.8 102J..

Each skater weighs m = 50 kg.

Two skaters are separated by a distance of d = 3m.

Each skater moves at a velocity of 1.4 meters per second.

The diameter of the circle formed by the separation of two stars. Then, we may determine the angular speed by using this and the relationship between v, r, ω. To get the kinetic energy of the two-skater system, enter the information into the rotating K.E. formula. As you get closer, continue the same process to locate the.

Equations: V = r ω

KE = 1/2 I ω²

Given that both skaters have the same mass and opposite, equal, and accelerating velocities, their total linear momentum is zero. As a result, the system's center of mass stays fixed at the pole's center.

They are 3 meters apart, and that distance will remain constant as it is the diameter of the circular motion they will be performing.

Consequently, the circular motion's radius is 1.5m.

Given that both skaters have the same mass and opposite, equal, and accelerating velocities, their total linear momentum is 0

As a result, the system's center of mass stays fixed at the pole's center.

They are 3 meters apart, and that distance will remain constant as it is the diameter of the circular motion they will be performing.

Consequently, the circular motion's radius is radius is 1.5m.

The angular speed of the skaters is

ω = 0.93 rad/s

The two-skater system's moment of inertia is I = (mr2) I = 2 (50) (1.5)2 I = 225 kgm 2.

The two-skater system's kinetic energy is K.E = I2 K.E = (225) (0.93)2 K.E. = 98J.

Step 6: When skaters pull along the pole until they are separated by 1.0 m, determine their angular speed (d)

The radius of the rotating motion would be r f = = 0.5m if the skaters drag the pole till they are separated by.

The two-skater system's M.I would then be

If = 25kgm2 and If = 2 (50) (0.5)2.

I0; = I f W f is the definition of the law of conservation of angular momentum.

As a result, the skaters' angular speed is given by f= If = 2250.93 25 of 8.4 rad/s =

Step 7: Determine the system's kinetic energy when skaters drag the pole until they are separated by 1.0 m. (e)

The two-skater system's kinetic energy is given by K.E = I2 K. E f = (25) (8.4)2 K. E. 8.8 102J.

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The aluminum foil is 2.5 millimeters thick. For instance, a certain roll measures 18.5 m^2 in size and weighs 1275 g. making use of the 2.7g/cm^3 density of aluminum.

Its density is defined as its mass per unit of volume (also known as specific mass or volumetric mass density). Although density can also be symbolised by the Latin letter D, the most typical mark is (the lower case Greek letter rho). The mathematical definition of density is mass divided by volume. Aluminum foil, usually referred to as aluminium foil in North American English, is a thin metal leaf made of aluminium that has a thickness of less than 0.2 mm (7.9 mils), but micrometres (0.24 mils) are also widely used. It is commonly known as tin foil.

In terms of thickness, 1275/(18.5*104*2.7*10-3) = 2.5mm.

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if it didn't have a ramp it would be harder to load the truck.

For a lens with a negative focal length, the image formed by an object placed at the focal point will be a virtual, inverted image with a magnification of -1. The object needs to be placed at the distance of the negative focal length in front of the lens for the magnification to be -1.

Magnification is the capability to make small objects appear larger. For instance using it to make a microscopic organism observable. Resolution is the capability to differentiate two objects from each other.

A concave lens always creates a erect, virtual, and reduced image irrespective of its position. Hence, the magnification is always positive, but less than 1.

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Answer:

48 J

Explanation:

Work Done = Force X Distance moved in a stated direction

Work Done = 3N + 5N X 6m

Work Done = 48 J

Two forces 3N and 5N acting on an object are inclined at 60 degrees to each other. If the resultant force moves the object a distance of 6m, the work done is 35.92 Joules (J).

In physics, work is defined as the transfer of energy that occurs when a force is applied to an object and the object is displaced in the direction of the force. Mathematically, work done is the product of the force applied and the distance moved in the direction of the force.

Work is a scalar quantity and is measured in joules (J) in the International System of Units (SI). When a force is applied to an object and there is no displacement, no work is done. Similarly, if there is displacement but no force acting on the object, no work is done.

Here in the Question,

To find the work done, we need to first find the resultant force.

Using vector addition, we can find the magnitude and direction of the resultant force:

cos(60) = adjacent/hypotenuse

adjacent = cos(60) x 5N = 2.5N

sin(60) = opposite/hypotenuse

opposite = sin(60) x 5N = 4.33N

The horizontal component of the 3N force is 3N cos(60) = 1.5N

The vertical component of the 3N force is 3N sin(60) = 2.6N

The horizontal component of the 5N force is 5N cos(30) = 4.33N

The vertical component of the 5N force is 5N sin(30) = 2.5N

The horizontal component of the resultant force is 4.33N + 1.5N = 5.83N

The vertical component of the resultant force is 2.5N + 2.6N = 5.1N

The magnitude of the resultant force is given by the Pythagorean theorem:

Resultant force = sqrt(5.83^2 + 5.1^2) = 7.59N

The direction of the resultant force is given by:

tan(theta) = opposite/adjacent

theta = tan^-1(5.1/5.83) = 43.1 degrees

The work done is given by:

work = force x distance x cos(theta)

work = 7.59N x 6m x cos(43.1) = 35.92 Joules (J)

Therefore, the work done is 35.92 Joules (J).

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All objects close to the earth are subject to the force of weight. You may determine an object's weight by multiplying its mass by the gravitational acceleration it experiences.

What does physics mean by acceleration?

The rate at which the velocity changes is the precise definition of acceleration. According to the aforementioned equation, the acceleration,, is determined by the ratio of the time it took for the speed to change from to and the difference between both the starting and final speeds,,.

How much of an acceleration is there?

The rate at which velocity changes is called acceleration. The rate at which of velocity in both size and direction provides the amount of the acceleration at every point on a trajectory.

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Her partner's final velocity is roughly -1.04 m/s, or 1.04 m/s in the opposite direction from her motion.

How do velocity and speed differ?

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.

What is velocity, for instance?

Velocity can be defined as the rate at which something moves in a specific direction. as the speed of a car driving north on a highway or the pace at which a rocket takes off.

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If the bottle is dropped from rest at a height of 1.2 m above the ground, it will take about 0.49 seconds for the water bottle to hit the ground by using the equation of motion.

To calculate the time it will take for the water bottle to hit the ground, we need to use the equation for motion under constant acceleration, which is the equation t = (2d/g)(1/2) is derived from the kinematic equation of motion, which relates the distance fallen (d), the initial velocity (vo), the final velocity (vf), acceleration (a), and time (t) in the following way: vf2 = 2a*d + vo2

t = (2*d / g)^(1/2)

where t is the time, d is the distance fallen, and g is the acceleration due to gravity (approximately 9.8 m/s2).

Plugging in the given values, we get:

t = (2 * 1.2 m) / 9.8 m/s^2

t = 0.49 s

So it will take about 0.49 seconds for the water bottle to hit the ground if it's dropped from a height of 1.2 meters above the ground.

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The ranking of the forces on the basis of the magnitude of the torque they apply to the wrench, measured about an axis centered on the bolt, is as follows: D > B >E > F > A > C.

Magnitude is a measure of the size or intensity of something. It is often used to describe the size of earthquakes, hurricanes, or other natural phenomena, as well as the strength of a person’s emotions or the size of a group of people.

A. Force E: This force is the farthest away from the bolt and applies the largest torque because it has the longest lever arm.
B. Force D: This force is second farthest away from the bolt and applies the second largest torque because it has the second longest lever arm.
C. Force C: This force is third farthest away from the bolt and applies the third largest torque because it has the third longest lever arm.
D. Force B: This force is fourth farthest away from the bolt and applies the fourth largest torque because it has the fourth longest lever arm.
E. Force F: This force is closest to the bolt and applies the fifth largest torque because it has the shortest lever arm.
F. Force A: This force is second closest to the bolt and applies the smallest torque because it has the second shortest lever arm.
Therefore, the ranking of the forces on the basis of the magnitude of the torque they apply to the wrench, measured about an axis centered on the bolt, is as follows: D > B >E > F > A > C.

In this case, the torque is determined by the magnitude of the angle force between the displacement vector and the applied force. Furthermore, torque can be maximised when the force is large in magnitude, located far away from the axis of interest, and oriented perpendicular to the displacement vector.

D > B >E > F > A > C.

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Answer:

  76.9 m/s

Explanation:

You want the speed of a 45.8 g golf ball after it has been hit by a 220 g club traveling 49.9 m/s, if the club is traveling 33.9 m/s in the same direction after the collision.

The conservation of momentum requires ...

  m1·v1 +m2·v2 = m1·v1f +m2·v2f

Rearranging this equation, we get ...

  m1·(v1 -v1f) = m2·(v2f -v2)

When v2 = 0, we can solve for v2f:

  m1(v1 -v1f)/m2 = v2f . . . . . . . divide by m2

In the given scenario, we have ...

The speed of the driven golf ball will be ...

  v2f = (220)(49.9 -33.9)/45.8 ≈ 76.9 . . . m/s

The speed of the golf ball after impact will be 76.9 m/s.

According to the question, 12 m should a spring of indefinite length be compressed to have a potential energy equivalent to a ball of mass 6 kg raised to a height of 120 m above the ground.

Potential energy is the energy of energy stored that depends on how various system elements interact with one another.

Potential Energy of ball = m x g x h

m= 6 kg

g= 10 m/s^2

h= 120 m

PE = 7200 J

Potential Energy of spring = 1/2 x k x d^2

k = 100 N/m

as we know that

Potential Energy of spring = Potential Energy of ball

1/2 x k x d^2 = m x g x h

d = 12 m

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The responses for the parameters of the block-spring system are;

(a) 1161.98

(b) 40.8 J

(c) 6.86 kg

(d) 2,75 m

(e) 25.9 J

(f) 14,9 J

(g) -0,224 m

The motion of a block-spring system is a simple harmonic oscillatory motion.

(a) The formula for the total kinetic energy is; K. E = (1/2)·k·x²

Where;

k = The spring constant

x = The diatplacemtent of the spring

The total mechanical energy, E = 40.8 J

The displacement of the spring, x = 0.265 m

Therefore;

40.8 = (1/2)·k·x²

k = 2 × (40.8/0.265²) ≈ 1161.98

The spring constant is about 1161.98 N/m

(b) The kinetic energy of the system at the equilibrium point is the same as the total energy or 40.8 J

(c) Kinetic energy, K.E. = (1/2)·m·v²

m = K.E./((1/2)·v²)

m = 10.8/(1/2×3.45²) ≈ 6.86

The mass is about 6.86 kg

(d) When the displacement is 0.160 m. we get;

What Is The Speed Of The Block When Irs Displacement Is 0.160 m

ω = √(k/m)

v = ω·√(A² - x²)

v = √(1161.98/6.86) × √(0.265² - 0.160²) ≈ 2.75

The velocity when the displacement is 0.160 m. is about 2.75 m/s

(e) The kinetic energy when the displacement is 0.160 m. is therefore;

K.E. = (1/2) × 6.86 × 2.75² ≈ 25.9

The kinetic energy when the displacement is 0.160 m. is about 25.9 J

(e) The total mechanical energy during the motion of the spring, is 40.8 J, we get;

P,E. = E - K,E,

The potential energy in the string when the displacement is 0.160 meters is therefore; P.E. = 40.8 - 25.9 = 14.9

The potential energy is 14.9 J

(g) Energy lost = 11.7 J

0.5 × 6.86 × ((1161.98/6.86) × (0.265² - x²) = 11.7

Solving, we get;

x ≈ -0.224 m

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If the atomic radius of gold is 0.144 nm, then the  volume of its unit cell in cubic meters is  6.7847 × 10⁻²⁹ m³.

A chemical element's atomic radius, which is typically the average or typical distance between the nucleus's centre and the outermost isolated electron, serves as a gauge for the size of its atom. There are numerous non-equivalent definitions of atomic radius because the boundary is not a clearly defined physical entity.  

Van der Waals radius, ionic radius, metallic radius, and covalent radius are the four most frequently used definitions of atomic radius. The atomic radius is typically measured in a chemically bonded state because it is difficult to isolate individual atoms to measure their radii separately.  

However, theoretical calculations are easier when considering isolated atoms. A variety of definitions result from the dependencies on environment, probe, and state.

Atomic radius of gold (r)  = 0.1442nm

                                         = 0.1442 × 10⁻⁹m

Gold is FCC then

FCC unit cell  side a        = [tex]2\sqrt{2r}[/tex]

Unit of the volume v        = a³ = ( [tex]2\sqrt{2r}[/tex] )

Unit cell volume (V)         = 16[tex]\sqrt{2\times r^{3}[/tex]

volume of unit cell           =6.7847  × 10⁻²⁹ m³

Thus, If the atomic radius of gold is 0.144 nm, then the  volume of its unit cell in cubic meters is  6.7847 × 10⁻²⁹ m³.

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Answer:

Approximately [tex]0.515\; {\rm m\cdot s^{-2}}[/tex] (assuming that all other forces are negligible).

Explanation:

Look up the following quantities:

At a distance of [tex]r[/tex] from the center of the Earth, the magnitude of the gravitational field strength of the Earth would be:

[tex]\begin{aligned} g &= \frac{G\, M}{r^{2}}\end{aligned}[/tex].

In this question, the asteroid is at [tex]3.30\, R[/tex] above the surface of the Earth. The actual distance between the asteroid and the center of the Earth would be [tex]r = (3.30 + 1)\, R[/tex].

Thus, at the current position of this asteroid, the magnitude of the gravitational field of the Earth would be:

[tex]\begin{aligned} g &= \frac{G\, M}{r^{2}} \\ &= \frac{G\, M}{((3.30 + 1)\, R)^{2}} \\ &\approx \frac{(6.6743 \times 10^{-11}\; {\rm m^{3}\cdot kg^{-1}\cdot s^{-2}})\, (5.792 \times 10^{24}\; {\rm kg})}{((3.30 + 1)\, (6.371 \times 10^{6}\; {\rm m}))^{2}} \\ &\approx 0.515\; {\rm m\cdot s^{-2}}\end{aligned}[/tex].

Assume that the gravitational attraction from the Earth is the only force on this asteroid. Acceleration of the asteroid would be equal to the gravitational field strength: approximately [tex]0.515\; {\rm m\cdot s^{-2}}[/tex].

The peak current through 200 ohm resistor for both the cases 50mA.

The number of turns times the size of the coil times the magnetic field's intensity times the angular speed equals peak emf.

The largest amount of current that an output is capable of providing for brief periods of time is known as the peak current. When an electrical device or power source is turned on for the first time, a large initial current known as the peak current flows into the load, starting at zero and increasing until it reaches a peak value.

Formula for the peak current is

peak current=[tex]\frac{peak voltage}{resistance}[/tex]

As in the formula it does not matter whether frequency changes or not.

So, peak current in both cases will be

peak current=[tex]\frac{10}{200}[/tex]

peak current=50mA

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The resistance of a 1500 watt (120 volt) hair dryer is 12 ohms.

Resistance is an opposition or a refusal to accept or comply with something. It is the ability to withstand or overcome something, such as an opposing force or influence. Resistance can also refer to a process of gradual change or transformation over time. Resistance is often seen in the form of protests, civil disobedience, or other forms of dissent. Resistance can also refer to the refusal to accept something as true or valid, such as a political or social ideology.

This can be determined by using Ohm’s Law, which states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, if the voltage is 120 volts and the wattage is 1500 watts, the resistance can be calculated as follows: R = V/I = 120/1500 = 0.08, or 12 ohms.

It is important to note that the above calculation only applies to a hair dryer that runs on direct current (DC). If the hair dryer is running on alternating current (AC), the resistance may be slightly different. The resistance of an AC-powered hair dryer can be determined by measuring the current and voltage with a multimeter.

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The tension in the cord is 81.82 N, if the elevator moves 1 m in the first 1.8 seconds.

Initial speed of the elevator, u = 0 (at rest)

Distance travelled by the elevator, S = 1 meter

Time taken to cover the that distance, t = 1.8 s

Let the acceleration of the elevator = a

Mass of the bundle, m = 8.9 kg

By the second equation of motion,

S =ut + 0.5at²

1 = 0 × 1.8 + 0.5×a×1.8²

a = 2/1.8²

Acceleration, a = 0.617 m/s²

Weight of the bundle acting downward = 8.9×9.81 = 87.31 N

Upward force on the bundle, F = 8.9 × 0.617 = 5.49

Net tension in the cord = (87.31 - 5.49)

= 81.82 N

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Answer: 4 seconds are elapsed before the cannonball strikes the ground.

Explanation:

Height of tower (h) = 80m

Initital velocity in x-dir ([tex]u_{x}[/tex]) = 337m/s

Initial velocity in y-dir ([tex]u_{y}[/tex]) = 0m/s

Time of flight (T)

Gravitational acceleration (g) = 10 m/s

Using second equation of motion,

h = [tex]u_{y}[/tex] + [tex]\frac{1}{2}[/tex]g[tex]t^{2}[/tex]

80 = [tex]\frac{1}{2}[/tex]×10×[tex]T^{2}[/tex]

[tex]T^{2}[/tex] = 16

T = 4s