15 20 The diagram shows the speed-time graph for 100 seconds of a car's journey. The car accelerates uni fonnly from a speed ofv m/s to a spced of 3v m/s in 50 seconds. It then continues at a constant speed. 3v Speed (m/s) 0- 50 100 Time (t seconds) (a) Find, in terms of v, the accclcration of the car in the first 50 seconds. Answer m/s? [1] (b) The car travels 2500 metres during the 100 seconds. Find v. Answer [2] (c) Find the speed of the car, in kilometres per hour, when 1 = 75 Answer km/h [1]