A ball is set in motion at P on a frictionless surface. It moves up slope PQ, along the horizontal surface QR and finally descends slope RS. [Figure showing a ball moving from P up a slope to Q, then horizontally along QR, then down a slope from R to S.] Which graph could represent the variation with time t of the ball's speed v as the ball moves from P to S?
✓ Correct Answer
The correct answer is A: graph where speed v decreases from P to Q, remains constant from Q to R, and increases from R to S.
📋 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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