A-LevelPhysicsDynamics9702/12 · May/June 2015 · Q101 Mark
A firework rocket is fired vertically upwards. The fuel burns and produces a constant upwards force on the rocket. After 5 seconds there is no fuel left. Air resistance is negligible. What is the acceleration before and after 5 seconds?
Abefore 5 seconds: constant, after 5 seconds: constant
Bbefore 5 seconds: constant, after 5 seconds: zero
Cbefore 5 seconds: increasing, after 5 seconds: constant
Dbefore 5 seconds: increasing, after 5 seconds: zero
✓ Correct answer
C: before 5 seconds: increasing, after 5 seconds: constant
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