A-LevelPhysicsDynamics9702/12 · Oct/Nov 2021 · Q101 Mark
The table shows four different collisions between two blocks, each of mass 0.50 kg. [Figure 10.1] Which collision is perfectly elastic?
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Abefore collision: block 1 (4.0 m s⁻¹, 0.50 kg), block 2 (0.0 m s⁻¹, 0.50 kg); after collision: block 1 (2.0 m s⁻¹, 0.50 kg), block 2 (2.0 m s⁻¹, 0.50 kg)
Bbefore collision: block 1 (2.0 m s⁻¹, 0.50 kg), block 2 (2.0 m s⁻¹, 0.50 kg); after collision: block 1 (0.0 m s⁻¹, 0.50 kg), block 2 (0.0 m s⁻¹, 0.50 kg)
Cbefore collision: block 1 (2.0 m s⁻¹, 0.50 kg), block 2 (1.0 m s⁻¹, 0.50 kg); after collision: block 1 (2.0 m s⁻¹, 0.50 kg), block 2 (3.0 m s⁻¹, 0.50 kg)
Dbefore collision: block 1 (4.0 m s⁻¹, 0.50 kg), block 2 (1.0 m s⁻¹, 0.50 kg); after collision: block 1 (1.0 m s⁻¹, 0.50 kg), block 2 (4.0 m s⁻¹, 0.50 kg)
✓ Correct answer
D: before collision: block 1 (4.0 m s⁻¹, 0.50 kg), block 2 (1.0 m s⁻¹, 0.50 kg); after collision: block 1 (1.0 m s⁻¹, 0.50 kg), block 2 (4.0 m s⁻¹, 0.50 kg)
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