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The upper portion of an inclined plane o...

The upper portion of an inclined plane of inclination `alpha` is smooth and the lower portion is rough. A particle slide down from rest from the top and just comes to rest at the foot. If the ratio of the smooth length to rough length is m:n, the coefficient of friction is

A

`[ (m +n)/(n)] tan alpha `

B

`[ (m +n)/(n) ] cot alpha `

C

`((m-n)/(n)) cot alpha `

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
A
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