The diagram shows two spherical masses approaching each other head-on at an equal speed u. One has mass 2m and the other has mass m. [Figure 8.1] Which diagram, showing the situation after the collision, shows the result of an elastic collision?
✓ Correct Answer
The correct answer is A: 2m mass moving left with speed u/3, m mass moving left with speed 5u/3
📋 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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