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A particle of mass m collides with anoth...

A particle of mass `m` collides with another stationary particle of mass `M` such that the second particle starts moving and the first particle stops just after the collision. Then which of the following conditions must always be valid ?

A

`m//M lt 1`

B

m/M = 1

C

e = 1

D

`e lt 1`

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The correct Answer is:
A
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