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In the adjacent figure, x-axis has been ...

In the adjacent figure, x-axis has been taken down the inclined plane. The coefficient of friction varies with `x` as `mu = kx`, where `k = tan theta`. A block is released at O

Frictional acting on the block just before it comes to rest :

A

`mg sin theta`

B

`2mg sin theta`

C

`(mg sin theta)/(2)`

D

`2mg cos theta`

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The correct Answer is:
b
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