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In the third law, the words action and reaction are said to mean nothing else but:

APlain fatigue
BPlain friction
CPlain fuel
DPlain force
Answer & Solution
Correct answer: D. Plain force
1. Two different words are used for the same physical idea. 2. That has caused endless confusion for students. 3. Both terms mean plain force. _Source: syllabus Physics Part I, Chapter 5, Laws of Motion._
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