There are two inclined surfaces of equal length (L) and same angle of inclination 45 with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down on rough surface than on the smooth surface. The coefficient of kinetic friction ( k) between the object and the rough surface is close to

1. A. 0.75
2. B. 0.25
3. C. 0.40
4. D. 0.5

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