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Q.

A uniform chain of mass ‘m’ and length l is on a table with 14 of its length hanging freely from the edge of the table. The amount of work done is dragging the chain on to the table completely is

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a

mgl

b

mgl8

c

mgl32

d

mgl16

answer is C.

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Detailed Solution

Wext+Wgr=ΔK.E=0Wext=−Wgr=−−ΔV=ΔV⇒Wext=Vf−ViWe also know V=mglCOMSo,Vi=−m4.g.l8=−mgl32Vf=0Wext=mgl32
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