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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

`mu=sin theta`

B

`mu=cot theta`

C

`mu=2cos theta`

D

`mu=2tan theta`

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The correct Answer is:
D
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