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A chain of mass m and length l is placed...

A chain of mass m and length l is placed on a table with one-sixth of it hanging freely from the table edge. The amount of work. done to pull the chain on the table is

A

`mgl//4`

B

`mgl//6`

C

`mgl//72`

D

`mgl//36`

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The correct Answer is:
C
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