A particle of mass m, travelling with speed u, collides with a stationary particle of mass M. The velocities of the two particles before and after the collision are shown. [Figure 10.1] Which vector diagram correctly shows the momenta before and after the collision?
✓ Correct Answer
The correct answer is B: Diagram B shows initial momentum mu as the vector sum of mu/2 (at angle beta above horizontal) and Mu/3 (at angle alpha below horizontal).
📋 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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