What is the correct answer?
4
A. (m.g + S₁)/(m.g + S₂) = r₁/r₂
B. (m.g - S₁)/(m.g - S₂) = r₂/r₁
C. S₁/S₂ = r₁/r₂
D. S₂/S₁ = r₁/r₂
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