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A uniform ring of mass 'm' and radius 'R...

A uniform ring of mass 'm' and radius 'R' is projected horizontally with velcoty `v_(0)` on a rough horizontal floor, so that it starts off with a purely sliding motion and it acquires a pure rolling motion after moving a distance d. If the coefficient of friction between the ground and ring is `mu`, then work done by the friction in the process is

A

`- mu m g d`

B

`- ( 1)/( 4) mv_(0)^(2)`

C

`mu m g d `

D

`- ( 1)/( 8) mv_(0)^(2)`

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The correct Answer is:
B
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