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Two masses 2m and m are connected by an ...

Two masses `2m` and `m` are connected by an inextensible light string. The string is passing over a light frictionless pulley. The mass `2m` is resting on a surface and mass in is hanging in air as shown in Fig. A particle of mass in strikes the mass in from below in case (I) with a velocity `v_(0)` and in case (II) strikes mass in with a velocity `v_(0)` from top and sticks to it.

A

The conservatios of linear momentum can be applied in both the cases just before and just after collision.

B

The conservation of linear momentum can be applied in case I but be applied in case II just before and just after collision.

C

The ratio of velocities of mass m just after collision in first and second cases is 1/2

D

The ratio of velocities of mass m just after collision in first and second case is 3.

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The correct Answer is:
B
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