# Two particles A and B initially at rest, move towards each other mutual force of attraction. At the instant when teh speed of A is V and speed of B is 2V, the speed of centre of mass is

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by Deleted account

2014-10-01T16:13:08+05:30

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Initially both A and B were at rest. So momentum of centre of mass is 0. And it is given that there is no external force. Hence no change in momentum of centre of mass. And it will remain 0. As momentum(product of mass and velocity) is zero ans mass is not zero, velocity must be 0.
how can there be any system with one particle?
When you run alone, you form a system with only one person.
yeah. thanks a lot you prove to be a helping hang
*hand
Thanks. I try my best.
2014-10-01T16:13:56+05:30
The speed of centre of mass is (2v/2v+v)+(v/2v+v)
⇒3v/3v=1