A-LevelPhysicsKinematicsOct/Nov 2009Paper 1 Q41 Mark
On a particular railway, a train driver applies the brake of the train at a yellow signal, a distance of 1.0 km from a red signal, where it stops. The maximum deceleration of the train is 0.2 m s⁻². Assuming uniform deceleration, what is the maximum safe speed of the train at the yellow signal?
A20 m s⁻¹
B40 m s⁻¹
C200 m s⁻¹
D400 m s⁻¹
✓ Correct Answer
The correct answer is A: 20 m s⁻¹
📋 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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