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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)` an 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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