A-LevelMathematicsMechanics9709/43 · May/June 2021 · Q14 Marks
Particles P of mass 0.4 kg and Q of mass 0.5 kg are free to move on a smooth horizontal plane. P and Q are moving directly towards each other with speeds 2.5 ms⁻¹ and 1.5 ms⁻¹ respectively. After P and Q collide, the speed of Q is twice the speed of P. Find the two possible values of the speed of P after the collision.
- Find the two possible values of the speed of P after the collision.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [M1] Attempt momentum before impact.
- [M1] Use of conservation of momentum, either case.
- [A1] One correct equation
- [A1] Both values
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