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Q.

Two particles A and B initially at rest, move towards each other by 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

zero

b

3v

c

1.5 v

d

v

answer is D.

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Detailed Solution

As the particles motion is due to mutual interaction net force on centre of mass will be zero. Therefore, centre of mass always remains at rest.

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Two particles A and B initially at rest, move towards each other by 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