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Class 11 NEET Physics Laws of Motion Questions

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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 ( µk ) between the object and the rough surface is close to

0.5
0.75
0.25
0.40

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