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A man pulls a bucket of water from a depth of h from a well. If the mass of the rope and that of bucket full of water are m and M respectively, the work done by the man is

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$(M + m) gh$

$(\frac{M}{2} + m) gh$

$(\frac{M + m}{2}) gh$

$(M + \frac{m}{2}) gh$

answer is B.

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Detailed Solution

Change in pot energy of bucket= Mgh

Change in pot energy of rope= mgh/2

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