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With zero total external force, the total linear momentum stays:

AConstant
BGrowing
CFalling
DSwinging
Answer & Solution
Correct answer: A. Constant
1. External force is what changes a system's momentum. 2. Remove it and nothing acts to alter the total. 3. So the total linear momentum is constant. _Source: syllabus Physics Part I, Chapter 7, Systems of Particles and Rotational Motion._
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