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2 bodies of different masses of 2 kg and...

2 bodies of different masses of 2 kg and 4 kg are moving with velocities `20 m//s` and 10 m//s towards each other due to mutual gravitational attraction. What is the velocity of their centre of mass?

A

`5m//s`

B

`6m//s`

C

`8m//s`

D

zero

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