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A man places a chain (of mass m and leng...

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 main brings down the chain by length `l//2`. Work done by the man in this process is

A

`-(mgl)/(2)`

B

`-(mgl)/(4)`

C

`-3(mgl)/(8)`

D

`-(mgl)/(8)`

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The correct Answer is:
C
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