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Q.

Two particles A and B initially at rest move towards each other under a mutual force of attraction.  At the instant when the speed of A is 3V and the speed of B is 4v, the speed of the centre of mass of the system is

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a

V

b

0

c

2.5V

d

1.5V

answer is A.

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Detailed Solution

  

There is no external force. As they are initially ate rest , com is also at rest

V¯cm=0

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