Physics (AS & A Level) · Oct / Nov 2023 · Paper 21 · Question 3

A trolley A moves along a horizontal surface at a constant velocity towards another trolley B which is moving at a lower constant speed in the same direction. Fig. 3.1 shows the trolleys at time t = 0. horizontal surface A B Fig. 3.1 Table 3.1 shows data for the trolleys. Table 3.1 trolley mass / kg initial speed / m s–1 A 0.25 0.48 B 0.75 0.12 The two trolleys collide elastically and then separate. Resistive forces are negligible. Fig. 3.2 shows the variation with time t of the velocity v for trolley B. 0 –0.1 –0.2 –0.3 –0.4 –0.5 0.1 0.1 0 0.2 0.3 0.4 0.5 0.2 0.3 0.4 0.5t / s v / m s–1 B Fig. 3.2

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