Q .     Starting from rest, the time taken by a body sliding down on a rough inclined plane at 45° with the horizontal is, twice the time taken to travel on a smooth plane of same inclination and same distance. Then the coefficient of kinetic friction is

BITSAT 2008
A

`0.55`

B

`0.65`

C

`0.5`

D

`0.75`

HINT

` mu = tan theta (1 - 1/n^2)`

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