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A chain of mass m 4 kg and length 2 m rests on a rough...

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A chain of mass m 4 kg and length 2 m rests on a rough horizontal surface such that some part of it hangs vertically when a small jerk is given the chain starts sliding down all by itself if the work done by friction till the chain slides of completely is 7 5 J then fraction of chain hanging initially is A 1 3 B 2 3 C 112 LD 14

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