Physics (AS & A Level) · May / June 2019 · Paper 21 · Question 2

A block X slides along a horizontal frictionless surface towards a stationary block Y, as illustrated in Fig. 2.1. X Y surface momentum 0.40 kg m s–1 Fig. 2.1 There are no resistive forces acting on block X as it moves towards block Y. At time t = 0, block X has momentum 0.40 kg m s−1. A short time later, the blocks collide and then separate. The variation with time t of the momentum of block Y is shown in Fig. 2.2. – 0.60 – 0.50 – 0.40 – 0.30 – 0.20 – 0.10 0 0.10 0.20 0.30 0.40 0.50 0.60 0 20 40 60 80 100 120 140 160 momentum / kg m s–1 t / ms block Y Fig. 2.2

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