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Per NCERT §7.3 (eqn 7.4), the force on mass m₂ due to m₁ and the force on m₁ due to m₂ obey which relation?
AF₁₂ = −F₂₁ (action-reaction)
BF₁₂ = 0 (gravity is one-sided)
CF₁₂ = +F₂₁ (same direction)
DF₁₂ = 2 F₂₁ (heavier on lighter)
Answer & Solution
Correct answer: A. F₁₂ = −F₂₁ (action-reaction)
NCERT §7.3: Newton's 3rd law applies — the pair is equal in magnitude, opposite in direction.
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