A chain (mass M) is hanging from a woode...

A chain (mass M) is hanging from a wooden structure as shown in the figure A. It is slowly taken to a state as shown in the figure B. Calculate the work done by gravity in the process (assume that after reaching the ground, the chain does not form a heap)

A

`(Mg)/(4a+pib)[4a^(2)+b^(2)+abpi]`

B

`(Mgb)/(4a+pib)[b+api]`

C

`(2Mg)/(2a+pib)[4a^(2)-b^(2)+abpi]`

D

`(Mgb)/(2a+pib)[b+api]`

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The correct Answer is:

D

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