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4 A body of mass 20 kg starts from rest at the top of a...

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4 A body of mass 20 kg starts from rest at the top of a hill of height 50 m and moves down the rough curved track If its speed at the bottom is 30ms the work done by friction is g 10ms 1 10 000 T 2 1000 50 m 2 1001 4 10 1

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