Question

If net external force acting on a system, (having more than one
mass), is zero, then
Net momentum of the system will not change
Momentum of the individual masses may change
Momentum of the system will change
Both (1) and (2)​

Answer 1

The answer is that a change in motion is equivalent to a change in velocity. A change in velocity means, by definition, that there is an acceleration. Newton's first law says that a net external force causes a change in motion; thus, we see that a net external force causes acceleration.

Momentum of system will change.

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