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An isolated system is one for which the net external force is:
AZero
BFixed
CHuge
DTiny
Answer & Solution
Correct answer: A. Zero
1. Then momentum cannot change.
2. Net external force is zero.
3. Total momentum is conserved.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 8, Linear Momentum and Collisions (CC BY 4.0)._
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