Mathematics (AS & A Level) · Feb / March 2025 · Paper 42 · Question 5

3 m P 3 m 0.6 kg Q 0.4 kg R 0.8 kg Three particles P, Q and R, of masses 0.6 kg, 0.4 kg and 0.8 kg respectively, are at rest in a straight line on a smooth horizontal plane. The distance from P to Q is 3 m, and the distance from Q to R is also 3 m (see diagram). P is projected directly towards Q with speed . m 3 s 1 - After P and Q collide, P continues to move in the same direction with speed . . m 1 5 s 1 -

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