A) The linear momentum of a system cannot be changed.
B) The linear momentum of a system cannot remain constant.
C) The linear momentum of a system can be changed only if internal forces act.
D) The linear momentum of a system can be changed only if external forces acts on it.
Correct Answer: D
Solution :
The principle of conservation of linear momentum states that, if no external force acts on a system, the momentum of the system remains constant.
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