A block released from rest from the top of a smooth inclined plane of inclination 45 takes time t to reach the bottom. The same block released from rest from top of a rough inclined plane of the same inclination takes time 2t to reach the botttom. The coefficient of friction is
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Coefficient of friction is given by tan theta (n*n-1/n*n) on putting the value we get tan 45°[ 4-1/4] = 3/4 0.75
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