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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 will again come to rest to the bottom if the coefficient of friction for the lower half is given by

A

`mu=(2)/(tan theta)`

B

`mu=2tan theta`

C

`mu=tan theta`

D

`mu=(1)/(tan theta)`

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