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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 =(2)/(tantheta)`

B

`mu =2 tan theta`

C

`mu =tantheta`

D

`mu =(1)/(tantheta)`

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