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Q.

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

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a

v

b

1.5v

c

3v

d

zero

answer is D.

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Detailed Solution

Fext=0; acm=0 Since initial velocity of centre of mass is zero , velocity of centre of mass is always zero .
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Two particles A and B which are initially at rest move towards each other under the mutual force of attraction. At the instant when the speed of A is v and the speed of B is 2v. the speed of the centre of mass of the system is -