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The motion of centre of mass depends on

1. total external forces
2. total internal forces
3. sum of \( (a) \) and \( (b) \)
4. None of these

Correct answer: total external forces

Solution

The centre of mass of a system accelerates according to the net external force acting on the system. Internal forces occur in equal and opposite pairs, so they do not change the motion of the centre of mass.

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