To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at 
and the block is released from rest. The block takes a time 
in moving a distance 
. The rough surface is then replaced by a smooth surface and the same experiment is repeated. Block now takes a time 
in moving down the same distance 
. The coefficient of friction is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
If the same wedge is made rough, then time taken by the block to come down becomes 
times. The coefficient of friction is
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