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A particle moves along a rough plane inclined at 30? to the horizontal. The co-efficient of friction between the particle and the plane is 0.1. Its initial velocity is 15 m/sec. The ratio of the velocity of the particle when it move down the plane to that when it move up the plane would be in the regions

[A].	2 ? 3	[B].	4 ? 6
[C].	5 ? 7	[D].	8 ? 10
[E].	10 ? 13

Answer: Option C

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