Starting from rest, the time taken by a body sliding down on a rough inclined plane at 450 with the horizontal is twice the time taken to travel on a smooth plane of the same inclination and same distance. Then, the coefficient of kinetic friction is

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Starting from rest, the time taken by a body sliding down on a rough inclined plane at $45^{0}$ with the horizontal is twice the time taken to travel on a smooth plane of the same inclination and same distance. Then, the coefficient of kinetic friction is

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0.75

0.25

0.50

0.33

answer is D.

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