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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 blocks will again collide after time:

A

6 sec

B

4 sec

C

8 sec

D

`oo`

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