Two balls P and Q, of equal mass, move along a straight line directly towards each other as shown. [Figure showing balls P and Q approaching] Ball P has velocity 1.30ms⁻¹ to the right. Ball Q has velocity 0.50 ms⁻¹ to the left. P and Q collide with one another. The collision is perfectly elastic and the total momentum is conserved. Which diagram correctly shows the motion of P and Q after the collision?
✓ Correct Answer
The correct answer is D: [Diagram D showing P moving left at 0.50 m s⁻¹ and Q moving right at 1.30 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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