A-LevelPhysicsDynamics9702/12 · Oct/Nov 2025 · Q121 Mark
Two different blocks, P and Q, slide towards each other on a horizontal frictionless surface. The blocks have an elastic collision. The diagram shows the velocities of the two blocks immediately after the collision. [Figure 12.0] Which row gives possible velocities of the two blocks immediately before the collision?
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A10 cm s⁻¹ to the right, 60 cm s⁻¹ to the left
B50 cm s⁻¹ to the right, zero
C20 cm s⁻¹ to the left, 70 cm s⁻¹ to the right
D60 cm s⁻¹ to the right, 30 cm s⁻¹ to the left
✓ Correct answer
D: 60 cm s⁻¹ to the right, 30 cm s⁻¹ to the left
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