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Q.

A bucket filled with water weighing 20 kg is slowly raised from a well of depth 20m. If the linear density of the rope is 0.2kg per meter, the amount of work done is, (g = 10m/s2)

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a

4000J

b

4040J

c

4400J

d

4200J

answer is C.

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Detailed Solution

W=mgh+MgL2=20×10×20+4×10×202w = 4400 J
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