During a game of cricket, a player hits a ball with a bat. The ball then travels vertically upwards, as shown in Fig. 8.1. The speed of the ball as it leaves the bat is 8.7 m/s. [Figure 8.1]

1. (a)(i)1The mass of the ball is 0.16kg. State what is meant by mass.[1]
2. (a)(i)2State the name of a measuring instrument that is used to determine mass.[1]
3. (a)(ii)Calculate the kinetic energy of the ball as it leaves the bat.[3]
4. (b)(i)1Fig. 8.2 is the velocity-time graph for the ball. Fig. 8.2 shows that immediately after being hit, the ball has a negative acceleration. State the name given to a negative acceleration. [Figure 8.2][1]
5. (b)(i)2State how the graph shows that the ball has a negative acceleration.[1]
6. (b)(ii)1Using Fig. 8.2, determine the time at which the ball stops moving upwards,[1]
7. (b)(ii)2the distance travelled before the ball stops moving upwards.[2]
8. (b)(iii)Suggest why the graph, in Fig. 8.2, is almost vertical when time = 1.84 s.[1]
9. (b)(iv)Fig. 8.2 shows that the ball remains stationary after a time of 1.84 s. Describe the energy change that is occurring at a time of 1.84 s.[2]
10. (c)For this ball moving in the way shown, the effect of air resistance is negligible. When a ball with a much smaller mass is hit vertically upwards at the same speed, air resistance produces a noticeable effect on its motion. Suggest two ways in which the velocity-time graph for the ball with a smaller mass differs from Fig. 8.2. 1. 2.[2]

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