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Question

A uniform chain of length L and mass m is hanging down vertically from a hook fixed to the roof. The work done in hooking the other end of the chain as shown is
304.JPG

A
mgL
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B
mgL2
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C
mgL4
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D
mgL8
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Solution

The correct option is A mgL4
W.D =Δ(P.E) =m2×g×L2=mgL4
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