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A chain is held on a frictionless table ...

A chain is held on a frictionless table with L/4 hanging over. Knowing total mass of the chain is M and total length L, the minimum work required to 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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