Which of the following is incorrect ?

Physics System of Particles Rotational Motion Centre of Mass MCQ (Single Correct)

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

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

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

None of these statement is incorrect

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The correct answer is:

When the centre of mass remains at rest, it is possible that different individual forces do individual works though the net resultant force is zero. As work is a scalar quantity, they gets added up.

Also, Σ F ext = 0 ⇒ a CM = 0.

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