A-LevelMathematicsMechanicsOct/Nov 2022Paper 4 Q25 Marks
Small smooth spheres A and B, of equal radii and of masses 6 kg and 2 kg respectively, lie on a smooth horizontal plane. Initially A is moving towards B with speed 5 m s⁻¹ and B is moving towards A with speed 3 m s⁻¹. After the spheres collide, both A and B move in the same direction and the difference in the speeds of the spheres is 2 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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