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 particle moves along a rough plane inclined at 30? to the horizontal

1.	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.	8 ? 10
B.	5 ? 7
C.	2 ? 3
D.	4 ? 6
E.	10 ? 13
Answer» C. 2 ? 3