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A particle at rest is constrained to mov...

A particle at rest is constrained to move on a smooth horizontal surface. Another identical particle hits the stationary particle with a velocity `v` at an angle `theta=60^(@)` with horizontal. If the particles move together, the velocity of the combination just after the impact is equal to

A

v

B

v/2

C

`sqrt(3)v//4`

D

v/4

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The correct Answer is:
D
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