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A block sliding down a rough 45° incline...

A block sliding down a rough 45° inclined plane has half the velocity it would have had, the inclined plane been smooth. The coefficient of sliding friction between block and the inclined plane is

A

`1/3`

B

`3/4`

C

`1/2sqrt2`

D

`8/9`

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The correct Answer is:
D
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