A-LevelPhysicsDynamics9702/12 · Feb/Mar 2024 · Q81 Mark
Two balls P and Q, of equal mass, move along a straight line directly towards each other as shown. [Figure showing balls P and Q approaching] Ball P has velocity 1.30ms⁻¹ to the right. Ball Q has velocity 0.50 ms⁻¹ to the left. P and Q collide with one another. The collision is perfectly elastic and the total momentum is conserved. Which diagram correctly shows the motion of P and Q after the collision?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A[Diagram A showing P moving left at 0.22 m s⁻¹ and Q moving right at 0.58 m s⁻¹]
B[Diagram B showing P moving left at 0.40 m s⁻¹ and Q moving right at 0.40 m s⁻¹]
C[Diagram C showing P moving left at 0.19 m s⁻¹ and Q moving right at 0.99 m s⁻¹]
D[Diagram D showing P moving left at 0.50 m s⁻¹ and Q moving right at 1.30 m s⁻¹]
✓ Correct answer
D: [Diagram D showing P moving left at 0.50 m s⁻¹ and Q moving right at 1.30 m s⁻¹]
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