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A block is given certain upward velocity...

A block is given certain upward velocity along the incline of elevation `alpha`. The time of ascent to upper point was found to be half the time of descent to initial point. The co-efficient of friction between block and incline is :

A

`0.5 tan alpha`

B

`0.3 tan alpha`

C

`0.6 tan alpha`

D

`0.2 tan alpha`

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The correct Answer is:
C
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