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The momentum of a system is conserved: I. when no net external force act on the system II. when no internal forces act on the system III. always
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The momentum of a system is conserved:

I. when no net external force act on the system

II. when no internal forces act on the system

III. always

User TotallyNewb
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2 Answers

23 votes
23 votes
I think the answer is I.
User Chavez
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11 votes

Answer:

I. when no net external force act on the system

Step-by-step explanation:

Suppose you are exerting an external force F on an object, it's velocity keeps increasing. Which means its momentum = velocity * mass is also increasing. In this case the initial momentum of that object is not preserved (but increased).

User DomQ
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