Physics · May / June 2020 · Paper 12 · Question 16
5054Energy
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.
As printed in the paper
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Correct answer: C. It increases by a factor of four.
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