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A block of mass 2 m collides,elastically...

A block of mass 2 m collides,elastically with a masss m kept at rest. Friction exists between the block B ,and surface with coefficient`mu=0.3`, whereas no.friction exists between block A and the surface.

The velocity of the blocks just after the first collision will be:

A

12 m/s, 3m/s

B

0, 9 m/s

C

3 m/s, 12 m/s

D

0, 18 m/s

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  • Block A of mass M in the system shown in the figure slides down the incline at a constant speed. The coefficient of friction between block A and the surface is 1 3 3 . The mass of block B is-

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