A ball falls vertically downwards towards a horizontal floor and then rebounds along its original path, as illustrated in Fig. 3.1. [Figure 3.1] The ball reaches the floor with speed 3.8 m s⁻¹. The ball is then in contact with the floor for a time of 0.081 s before leaving it with speed 1.7 m s⁻¹. The mass of the ball is 0.062 kg.

1. (a)Define force.[1]
2. (b)(i)Calculate the loss of kinetic energy of the ball during the collision.[2]
3. (b)(ii)Determine the magnitude of the change in momentum of the ball during the collision.[2]
4. (b)(iii)Show that the magnitude of the average resultant force acting on the ball during the collision is 4.2 N.[1]
5. (b)(iv)1.Use the information in (iii) to calculate the magnitude of: the average force of the floor on the ball during the collision[1]
6. (b)(iv)2.the average force of the ball on the floor during the collision.[1]

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