A man slowly pulls a bucket of water from a well of depth h = 20 m. The mass of the uniform rope and bucket full of water are m = 200 g and M= 19.9 kg, respectively. Find the work done (in kJ) by the man.

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answer is 4.

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Detailed Solution

As the centre of gravity of rope comes up by h/2 and that of bucket by h, required work would be W=mgh2+Mgh=4000 J=4 kJ

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