Two particles A and B initially at rest move towards each other under a mutual force of attracti....

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Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the
\( \mathrm{P} \)
instant when velocity of A is \( v \) and that of B is \( 2 v \) the velocity of center of mass of the system
(1) \( v \)
(2) \( 2 v \)
(3) \( 3 v \)
(4) zero


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