A-LevelPhysicsDynamicsFeb/Mar 2019Paper 1 Q101 Mark
Two balls, of masses m and 2m, travelling in a vacuum with initial velocities 2v and v respectively, collide with each other head-on, as shown. [Figure 10.1] After the collision, the ball of mass m rebounds to the left with velocity v. What is the loss of kinetic energy in the collision?
A½ mv²
B¾ mv²
Cmv²
D²⁄₃ mv²
✓ Correct Answer
The correct answer is C: 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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