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Two particles A and B, initially at rest, move towards each other under mutual force of attraction. At the instant when the speed of A is v and the speed of B is 2v, what is the speed of mass of the system?

Two particles A and B, initially at rest, move towards each other under mutual force of attraction. At the instant when the speed of A is v and the speed of B is 2v, what is the speed of mass of the system? Correct Answer Zero

No external force is acting on the centre of mass. It remains at rest. The speed of centre of mass is zero.

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S1:A force of exists between everybody in the universe.
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The Proper sequence should be:
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