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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.

How many collision are possible between the blocks?

A

2

B

4

C

27

D

Inifinite

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