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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.

After how much time collision between the blocks will not take place practically:

A

8 sec

B

16 sec

C

12 sec

D

Inifinite

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