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A uniform chain of length L and mass M i...

A uniform chain of length `L` and mass `M` is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is the acceleration due to gravity, the work required to pull the hanging part on to the table is

A

mgL

B

`(mgL)/3`

C

`(mgL)/9`

D

`(mgL)/18`

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The correct Answer is:
D
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