A-LevelPhysicsKinematicsMay/June 2013Paper 1 Q71 Mark
The diagram shows an arrangement to stop trains that are travelling too fast. [Figure showing train approaching marker 1, then marker 2, with speeds 50 m s⁻¹ and 10 m s⁻¹] Trains coming from the left travel at a speed of 50ms⁻¹. At marker 1, the driver must apply the brakes so that the train decelerates uniformly in order to pass marker 2 at no more than 10ms⁻¹. The train carries a detector that notes the times when the train passes each marker and will apply an emergency brake if the time between passing marker 1 and marker 2 is less than 20 s. How far from marker 2 should marker 1 be placed?
A200 m
B400 m
C500 m
D600 m
✓ Correct Answer
The correct answer is D: 600 m
📋 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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