A ball is dropped by the side of a vertical scale that is marked in centimetres. A video recording of the fall shows the position of the ball on the scale every 0.10s. The distance the ball falls is shown by the position on the scale. Table 1.1 shows the results. Table 1.1 time/s 0 0.10 0.20 0.30 0.40 0.50 distance/cm 0 5 20 44 78 123 [Figure 1.1]

1. (a)(i)On Fig. 1.1, plot the distance-time graph for the ball. Draw a suitable line.[2]
2. (a)(ii)Calculate the average speed of the ball between time t = 0 and time t = 0.40 s. speed = .................................................... cm/s[2]
3. (a)(iii)Describe how to use the graph in Fig. 1.1 to determine the speed of the ball at time t = 0.40 s.[2]
4. (b)(i)As the ball falls, the acceleration of the ball decreases and eventually becomes zero before it reaches the ground. Explain, in terms of the forces acting, why the acceleration decreases, and why it eventually becomes zero.[3]
5. (b)(ii)Describe the appearance of a distance-time graph when the acceleration of the ball is zero.[1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.