A-LevelPhysicsDynamics9702/12 · May/June 2021 · 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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A120 m s⁻¹
B140 m s⁻¹
C180 m s⁻¹
D260 m s⁻¹
✓ Correct answer
D: 260 m s⁻¹
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