A tutor asks which quantity a closed system always keeps in any collis…

Question

A tutor asks which quantity a closed system always keeps in any collision. The answer is:

Accepted Answer

C. Momentum

1. Kinetic energy is often lost in a crash.
2. Momentum has no such escape route.
3. A closed system always conserves momentum.
_Source: OpenStax University Physics Volume 1, Chapter 9, Linear Momentum and Collisions._

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Mass flow

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A tutor asks which quantity a closed system always keeps in any collision. The answer is:

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