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Vlad [161]
3 years ago
15

A book falls of the table and hits the floor. Is work done? Why?​

Physics
2 answers:
morpeh [17]3 years ago
6 0

<u>Yes, work is done when a book falls of the table.</u>

This is because:

When the book falls, it's potential energy is converted into kinetic energy.   As it reaches the floor down, this kinetic energy is converted to heat energy and sound energy due to the impact.

When a force is imposed on an object to cause displacement of that object, work is done on that object. For a force to do work on an object, there should be a displacement and this force should cause the displacement. So here, since the book falls from the table and causes the displacement of the book from the table to the floor. It is said that work is done.

Work can be given by the formula:

W = F • d

where F is the force and d is the displacement.

prohojiy [21]3 years ago
6 0

Answer:

potential energy

Explanation:

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An object is thrown up at 20m/s if it hits the ground after 10s,determine the final velocity and the height
dangina [55]

1) The final velocity of the object is -78 m/s (downward)

2) The final height of the object is -290 m

Explanation:

1)

When the object is thrown up, it follows a free fall motion, subjected only to the force of gravity (that pulls the object downward). Therefore, the object has a constant acceleration

g=9.8 m/s^2

towards the ground (acceleration of gravity).

Since this is a motion with constant acceleration, we can use the following suvat equation:

v=u+at

where

v is the final velocity

u is the initial velocity

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t is the time of flight

In this problem we have:

u = +20 m/s (taking upward as positive direction)

t = 10 s is the time of flight

g=-9.8 m/s^2 (downward, so negative)

Solving for v, we find the final velocity:

v=20+(-9.8)(10)=-78 m/s

2)

For this part of the problem, we can use another suvat equation:

s=ut+\frac{1}{2}at^2

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In this problem,

u = +20 m/s

t = 10 s

g=-9.8 m/s^2

Substituting, we find the final position of the object with respect to the initial position:

s=(20)(10)+\frac{1}{2}(-9.8)(10)^2=-290 m

Learn more about uniform accelerated motion:

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gladu [14]

Answer:

Hey mate

Explanation:

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Answer:

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Explanation:

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