Question

In which case does the momentum of an isolated system remain conserved?

• A. The net final momentum of the system is zero.
• B. The net initial momentum of the system is zero.
• C. The net external force on the system is zero.
• D. The net external force on the system is non-zero.

Answer 1

The correct option is C The net external force on the system is zero.

By the law of conservation of momentum, the momentum of an isolated system remains conserved when the external force on the system is zero.