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A block of mass 3M connected to a massle...

A block of mass `3M` connected to a massless rod of length L lies at rest on a fixed frictionless table. A second block of mass `M` moving with speed `v_0` strikes the opposite end of the rod at right angle and sticks. The velocity of centre of mass of the system after collision is

A

`v_0/4`

B

`v_0/3`

C

`v_0/2`

D

`v_0`

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