If the total momentum of a system is changing, then

The particles of system must exert force on each other

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The system must be under the influence of gravity

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A net external force must act on the system

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None of the above

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Solution

The correct option is C
A net external force must act on the system

Concept of momentum
By Newton’s second law: “ the net external force is equal to the rate of change of momentum”
If the total momentum of a system changes, there is some net external force acting on the system.
Therefore a net external force must act on the system
Hence, option (c) is correct

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