Physics (AS & A Level) · Feb / March 2019 · Paper 22 · Question 3

Two balls, X and Y, move along a horizontal frictionless surface, as illustrated in Fig. 3.1. X Y 60° 3.0 m s–1 A B 9.6 m s–1 2.5 kg Fig. 3.1 (not to scale) Ball X has an initial velocity of 3.0 m s–1 in a direction along line AB. Ball Y has a mass of 2.5 kg and an initial velocity of 9.6 m s–1 in a direction at an angle of 60° to line AB. The two balls collide at point B. The balls stick together and then travel along the horizontal surface in a direction at right-angles to the line AB, as shown in Fig. 3.2. A B V Y X Fig. 3.2

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