A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2023 · Q151 Mark

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?

A0.73 E

B0.86 E

C1.2 E

D1.4 E

✓ Correct answer

A: 0.73 E

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2023 Paper 1 Variant 2, question 15.

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