Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 17
9702Gravitational potential energy and kinetic energy
A railway engine accelerates a train of total mass 800 tonnes (1 tonne = 1000 kg) from rest to a speed of 50 m s⁻¹. How much useful work must be done on the train to reach this speed?
- A1.0 × 10⁶ J
- B2.0 × 10⁶ J
- C1.0 × 10⁹ J
- D2.0 × 10⁹ J
As printed in the paper
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Correct answer: C. 1.0 × 10⁹ J
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