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A man is supplying a constant power of 5...

A man is supplying a constant power of `500 J//s` to a massless string by pulling it at a constant speed of `10 m//s` as shown. It is known that kinetic energy of the block is increasing at a rate of `100 J//s`. Then, the mass of the block is

A

5 kg

B

3 kg

C

10 kg

D

4 kg

Text Solution

Verified by Experts

The correct Answer is:
D
Let F the force with which man pulls the block.
`Fv=500`
`(F-mg)v=100`
Solving `m=4kg`
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