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A chain is held on a frictionless talbe ...

A chain is held on a frictionless talbe with `L//4` hanging over. Knowing total mass of the chain is `M` and total length is `L`, the work required to slowly pull hanging part back to the table is `:`

A

`(MgL)/16`

B

`(MgL)/8`

C

`(MgL)/32`

D

`(MgL)/24`

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The correct Answer is:
C
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