A-LevelPhysicsDynamicsMay/June 2021Paper 1 Q101 Mark
A nitrogen molecule P travelling at a speed of 320 m s⁻¹ in a vacuum collides with a stationary nitrogen molecule Q. After the collision, P travels at a velocity of 180 m s⁻¹ at an angle of 55° to its original path. Q travels in a direction at an angle of 34° to the initial path of P. [Figure 10.1] Assume that there are no external forces acting on the molecules. What is the magnitude v of the velocity of Q after the collision?
A120 m s⁻¹
B140 m s⁻¹
C180 m s⁻¹
D260 m s⁻¹
✓ Correct Answer
The correct answer is D: 260 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep