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A swimmer pushes on the pool wall and accelerates away. The two equal and opposite forces do not cancel because they act on:
ADifferent systems
BThe same object
COnly the water
DOnly the wall
Answer & Solution
Correct answer: A. Different systems
1. One force acts on the wall, the other on the swimmer.
2. Forces on different systems cannot cancel.
3. Only the force on the swimmer moves her.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 4, Dynamics: Force and Newton's Laws of Motion (CC BY 4.0)._
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