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Q.

A man places a chain (of mass m and length l) on a table slowly. Initially, the lower end of the chain just touches the table. The man brings down the chain by length l/2. Work done by the man in this process is

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a

-mgl4

b

-3mgl8

c

-mgl2

d

-mgl8

answer is C.

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Detailed Solution

Change in potential energy = work done by force

W=ΔU=m2gl4-mgl2=-3mgl8

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