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:\

5 kg

3 kg

10 kg

4 kg

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