A-LevelPhysicsDynamicsMay/June 2018Paper 1 Q91 Mark
An elastic collision occurs between two bodies X and Y. The mass of body X is m and the mass of body Y is 4m. Body X travels at speed v before the collision and speed (3v)/5 in the opposite direction after the collision. Body Y is stationary before the collision. [Diagram] What is the kinetic energy of body Y after the collision?
A(8/10)mv²
B(34/50)mv²
C(16/50)mv²
D(1/5)mv²
✓ Correct Answer
The correct answer is C: (16/50)mv²
📋 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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