When studying one body only, the forces that matter number:
AFour
BFive
COne
DTwo
Answer & Solution
Correct answer: C. One
1. An action and reaction pair acts on two different bodies.
2. Only the force on the chosen body concerns its motion.
3. So just one of the two forces is relevant.
_Source: NCERT Class 11 Physics Part I, Chapter 5, Laws of Motion._
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