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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 = tan theta`

B

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

C

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

D

`mu = 2 tan theta`

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The correct Answer is:
D
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