The upper half of an inclined plane with inclination 
is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is
A
tan 
B
2 tan 
C
2 cos 
D
2 sin 
Text Solution
Verified by ExpertsThe correct answer is:
B
2tan 
For the smooth upper half, using v 2 - u 2 = 2 as, we get
For the lower half, using v 2 -u 2 =2 as, we get
or 
or 
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