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 )
$\frac{X}{{X - Y}}$
2 )
$\frac{Y}{{X - Y}}$
$\frac{{X - Y}}{X}$
4 )
$\frac{{X - Y}}{Y}$
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