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A rope is of mass M and length L .
L/n part of it is suspended from edge of the table .
Find work done by pulling force to bring rope back on the table...
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If length x of the chain is pulled up on the table. Then the length of hanging part of the chain would be (L3−x) and its weight would be ML(L3−x)g, If it is pulled up further by a distance dx, the work done in pulling up.
⇒dW=mL(L3−x)gdx⇒
W=∫L30ML(L3−x)gdx=MgL18
OR Required work done =(M3)g(L6)=MgL18
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