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A Iong slender rod of mass 2 kg and leng...

A Iong slender rod of mass `2 kg` and length `m` is placed on a smooth horizontal table. Two particles of masses `2 kg` and ` 1kg` strike the rod simultaneously and stick to the rod after collision as shown in fig.

Velocity of the centre of mass of the rod after collision is

A

`3 m//s`

B

`6 m//s`

C

`9 m//s`

D

`12 m//s`

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