O-LevelPhysicsEnergy & Work5054/11 · May/June 2020 · Q121 Mark
A rocket of mass M when empty carries a mass M of fuel. The rocket and fuel travel at speed v. The engine of the rocket is fired and all of the fuel is expelled. The speed of the rocket increases to 2v. What happens to the kinetic energy of the rocket?
AIt doubles.
BIt halves.
CIt increases by a factor of four.
DIt stays the same.
✓ Correct answer
C: It increases by a factor of four.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Energy & Work and see which topics are most likely to come up next.
Sign up free →