Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 17
9702Gravitational potential energy and kinetic energy
A railway engine accelerates a train of total mass 1200 tonnes (1 tonne = 1000 kg) from rest to a speed of 75 m s–1. How much useful work must be done on the train to reach this speed?
- A3.4 × 10^6 J
- B6.8 × 10^6 J
- C3.4 × 10^9 J
- D6.8 × 10^9 J
As printed in the paper
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Correct answer: C. 3.4 × 10^9 J
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