Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 15
An electric car travels at a constant speed of 70 km h⁻¹ for 80 km on a straight horizontal road and uses energy E from its battery. The total resistive force acting on the car is proportional to (speed)². Assume that the electric motor is 100% efficient. How much energy is used from the battery when the car travels at a constant speed of 60 km h⁻¹ for 80 km on the straight horizontal road?
- A0.73E
- B0.86E
- C1.2E
- D1.4E
As printed in the paper
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Correct answer: A. 0.73E
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