A body takes time 
to reach the bottom of an inclined plane of angle 
with the horizontal. If the plane is made rough, time taken now is 
. The coefficient of friction of the rough surface is
A
B
C
D
.
Text Solution
Verified by ExpertsThe correct answer is:
A
The free body diagram shows the various forces acting on the block. When plane is
frictionless, then acceleration, 
.
Let time taken is 
. Since, body starts from rest, initial velocity 
.
When plane is made rough, then acceleration 
, where 
is coefficient of friction.
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