25 The diagram is the speed–time graph representing part of a train’s journey. The train slows down uniformly from a speed of 40 m/s to a speed of 8 m/s in a time of 10 seconds. It then accelerates uniformly during the next 50 seconds. (a) Find the deceleration between t = 0 and t = 10. (b) Find the distance travelled from t = 0 to t = 10. (c) Between t = 10 and t = 60, the acceleration is 0.4 m/s^2. Calculate the speed when t = 60.