A-LevelPhysicsDynamics9702/12 · Feb/Mar 2019 · Q81 Mark
Two balls X and Y are moving towards each other with speeds of 5 m s⁻¹ and 15 m s⁻¹ respectively. [Figure 8.1] They make a perfectly elastic head-on collision and ball Y moves to the right with a speed of 7 m s⁻¹. What is the speed and direction of ball X 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.
A3 m s⁻¹ to the left
B13 m s⁻¹ to the left
C3 m s⁻¹ to the right
D13 m s⁻¹ to the right
✓ Correct answer
B: 13 m s⁻¹ to the left
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