What does the principle of conservation of linear momentum state?

1.	What does the principle of conservation of linear momentum state?
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.
Answer» E.

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What does the principle of conservation of linear momentum state?

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