Question

Q. A person holds a body of mass 20 kg over his head for 10 sec. Has he done any work? Justify
your answer
Q. A free falling body stops on reaching the ground. What happens to its kinetic energy?
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Answer 1

Answer:

No work is done !!

Explanation:

There are 2 factors for work to be done :

(1) A force should be applied

(2) displacement should take place

Answer 2

Answer:

When the object hits the ground, its kinetic energy gets converted into heat energy and sound energy.

Explanation:

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