A ball of mass m travelling at velocity u collides with a stationary ball of mass M. After collision the two balls travel at velocities v and V respectively, in the directions shown. [Figure 11.1] A student writes three equations relating to the collision. Which row in the table indicates the correct and incorrect equations?
✓ Correct Answer
The correct answer is D: mu = MV + mv: incorrect, mv sin 30° = MV sin 40°: correct, mv cos 30° + MV cos 40°: correct
📋 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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