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Which of the following is/are correct?...

Which of the following is/are correct?

A

If centre of mass of three particles is at rest and it is known that two of them are moving along different lines then the third particle must also be moving.

B

If centre of mass remains at rest then the net work done by the forces acting on the system must be zero.

C

If the centre of mass remains at rest then the net external force must be zero.

D

If the velocity of the centre of mass is changing then there must be some net work being done on the system

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The correct Answer is:
A, C
ac
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