O-LevelPhysicsEnergy & Work5054/12 · May/June 2015 · Q121 Mark
A rocket of total mass M is travelling at a speed v. The engine of the rocket is fired and fuel is used up. The mass of the rocket decreases to M/2 and its speed 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
A: it doubles
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