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The upper half of an inclined plane with...

The upper half of an inclined plane with inclination `phi` 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 given by

A

`2sinphi`

B

`2cosphi`

C

`2tanphi`

D

`tanphi`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • The upper half of an inclined plane of inclination 45^(@) is perfectly smooth while the lower half is rough. A block starting from rest at the top comes back to rest at the bottom. The coefficient of friction for the lower half is

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