A-LevelPhysicsDynamics9702/12 · Feb/Mar 2020 · Q101 Mark
The diagram shows a particle P, travelling at speed v, about to collide with a stationary particle Q of the same mass. The collision is perfectly elastic. [Figure showing particle P moving towards stationary particle Q] Which statement describes the motion of P and of Q immediately after the collision?
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AP and Q both travel in the same direction with speed ½ v.
BP comes to rest and Q acquires speed v.
CP rebounds with speed ½ v and Q acquires speed ½ v.
DP rebounds with speed v and Q remains stationary.
✓ Correct answer
B: P comes to rest and Q acquires speed v.
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