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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.

Maximum distance between the blocks during the time interval between first and second collision is:

A

12m

B

13.5m

C

20m

D

9m

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