The upper portion of an inclined plane of inclination 
is smooth, and the lower portion is rough. A particle slides down from rest from the top and just comes to rest at the foot. If the ratio of the smooth length to rough length is 
, the coefficient of friction is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let m be the distance travelled along smooth surface and n be the distance travelled along
rough surface.
On smooth surface, 
On rough surface,
On solving Eqs (i) and (ii), we get
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