A-LevelMathematicsMechanics9709/42 · Oct/Nov 2020 · Q13 Marks
Two particles P and Q, of masses 0.2 kg and 0.5 kg respectively, are at rest on a smooth horizontal plane. P is projected towards Q with speed 2 m s⁻¹.
- (a)Write down the momentum of P.[1]
- (b)After the collision P continues to move in the same direction with speed 0.3 m s⁻¹. Find the speed of Q after the collision.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] (a) Momentum = 0.2 × 2 = 0.4 kg ms⁻¹
- [2] (b) 0.4 = 0.2 × 0.3 + 0.5v
- [2] (b) Apply conservation of momentum, 3 terms
- [2] (b) v = 0.68 ms⁻¹
- [2] (b) FT on answer in 1(a)
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →