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WBJEE 2014 Physics Solved Paper

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Question : 8

Total: 60

To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at 45° andthe block is released from rest. The block takes a time t in moving a distance d.The rough surface is then replacedby a smooth surface and the same experiment is repeated. The block now takes a time t/2 in moving down thesame distance d. The coefficient of friction is

3/4
5/4
1/2
1/√2

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