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Velocity of COM

Two particles...

Question

Two particles A and B initially at rest move towards each other under a mutual force of attraction. The speed of centre of mass at the instant when the speed of A is v and the speed of B is 2v is

A

v

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B

Zero

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C

2 v

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D

3 v/2

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Solution

The correct option is A Zero
The external force acting on particle is zero.so, speed does not not change.
Hence, the speed of centre of mass at given instant is zero.

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