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

5 kg

3 kg

10 kg

4 kg

Text Solution

Verified by Experts

The correct Answer is:

Let F the force with which man pulls the block
`:. Fv = 500 :. F = 50 N(F - mg) =100`
solving `m = 4kg`

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