Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 16

During an interval of time, fuel supplies energy X to a car. Some of this energy is converted into kinetic energy as the car accelerates. The rest of the energy Y is lost as thermal energy. What is the efficiency of the car?

1. A\frac{X}{X-Y}
2. B\frac{Y}{X-Y}
3. C\frac{X-Y}{X}
4. D\frac{X-Y}{Y}

As printed in the paper