A-LevelPhysicsDynamics9702/12 · Oct/Nov 2015 · Q141 Mark
Two identical spheres X and Y approach each other with the speeds shown and undergo a head-on elastic collision. [Figure showing sphere X approaching Y with speed 4 ms⁻¹ and sphere Y approaching X with speed 2 ms⁻¹]
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.
Asphere X: 0 m s⁻¹, sphere Y: 2 m s⁻¹ (moving right)
Bsphere X: 2 m s⁻¹ (moving left), sphere Y: 4 m s⁻¹ (moving right)
Csphere X: 2 m s⁻¹ (moving right), sphere Y: 4 m s⁻¹ (moving right)
Dsphere X: 4 m s⁻¹ (moving left), sphere Y: 2 m s⁻¹ (moving right)
✓ Correct answer
C: sphere X: 2 m s⁻¹ (moving right), sphere Y: 4 m s⁻¹ (moving right)
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