A-LevelMathematicsMechanics9709/43 · May/June 2023 · Q13 Marks
Two particles P and Q, of masses 0.1kg and 0.4kg respectively, are free to move on a smooth horizontal plane. Particle P is projected with speed 4ms⁻¹ towards Q which is stationary. After P and Q collide, the speeds of P and Q are equal.
- Find the two possible values of the speed of P after the collision.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- [M1] For attempt at use of conservation of momentum in one case
- [A1] Speed = 0.8[ms⁻¹] or 4/5. Must be positive.
- [A1] Speed = 4/3 [ms⁻¹] Allow 1.33. Must be positive.
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