A-LevelMathematicsMechanicsOct/Nov 2021Paper 4 Q14 Marks
The diagram shows a velocity-time graph which models the motion of a car. The graph consists of six straight line segments. The car accelerates from rest to a speed of 20 ms⁻¹ over a period of 5 s, and then travels at this speed for a further 20s. The car then decelerates to a speed of 6 ms⁻¹ over a period of 5 s. This speed is maintained for a further (T – 30) s. The car then accelerates again to a speed of 20 m s⁻¹ over a period of (50 – T) s, before decelerating to rest over a period of 10 s. [Diagram]
📋 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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