A-LevelPhysicsDynamics9702/12 · May/June 2020 · Q91 Mark
A mass m₁ travelling with speed u₁ collides with a mass m₂ travelling with speed u₂ in the same direction. After the collision, mass m₁ has speed v₁ and mass m₂ has speed v₂ in the same direction. The collision is perfectly elastic. [Figure 9.1] Which equation is not correct?
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Am₁u₁² – m₁v₁² = m₂v₂² – m₂u₂²
Bv₂ + u₂ = v₁ + u₁
Cm₁(u₁ - v₁) = m₂(v₂ - u₂)
Dm₁(u₁ – v₁)² = m₂(u₂ - v₂)²
✓ Correct answer
D: m₁(u₁ – v₁)² = m₂(u₂ - v₂)²
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