A-LevelPhysicsWork, energy and powerMay/June 2024Paper 1 Q141 Mark
The force resisting the motion of a car is proportional to the square of the car's speed. The magnitude of the force at a speed of 20.0 m s⁻¹ is 800 N. What useful output power is required from the car's engine to maintain a steady speed of 40.0 m s⁻¹?
A32 kW
B64 kW
C128 kW
D512 kW
✓ Correct Answer
The correct answer is C: 128 kW
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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