A-LevelPhysicsDynamics9702/12 · May/June 2012 · Q121 Mark
Two spheres approach each other along the same straight line. Their speeds are u₁ and u₂ before collision. After the collision, the spheres separate with speeds v₁ and v₂ in the directions shown below. [Figure 12.1] Which equation must be correct if the collision is perfectly elastic?
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Au₁ - u₂ = v₂ + v₁
Bu₁ - u₂ = v₂ - v₁
Cu₁ + u₂ = v₂ + v₁
Du₁ + u₂ = v₂ - v₁
✓ Correct answer
D: u₁ + u₂ = v₂ - v₁
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