A car X is travelling at a constant speed u along a straight road. At time t = 0 a second car Y is a distance d₀ behind car X and travelling at a speed v in the same direction. Speed v is less than speed u. [Figure 6.1] At time t = 0 car Y begins to accelerate with a constant acceleration. Car Y overtakes car X at time t = T. Which graph could best show the variation with time t of the distance d between the cars? [Figure 6.2]
✓ Correct Answer
The correct answer is B: Graph showing d decreasing with time t, with a concave up curve, reaching 0 at time T and then increasing again.
📋 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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