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A solid sphere of mass m is placed on a ...

A solid sphere of mass m is placed on a rough incline plane as shown in figure. The coefficient of friction `(mu)` is insufficient to start pure rolling. The sphere slides length l on incline from rest and its kinetic energy becomes k. Then work done by friction will be

A

`mu m g cos theta`

B

`mu m g sin theta`

C

`(2)/(5) mg l sin theta - k`

D

`k - mgl sin theta`

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The correct Answer is:
D
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