A ball of mass 0,5 kg is projected vertically downwards from a height of 1,8 m with an initial velocity of 2 m.s1. The ball hits the ground and bounces two times. The position-time graph for the motion of the ball from the instant it is projected until it hits the ground after the second bounce is shown below. Ignore the effects of friction. Position (m) 1,8- 1,3. 0,9- 11 12 13 15 At(s) 3.1 Write down the maximum vertical height reached by the ball after the SECOND bounce? (1) 3.2 The ball strikes the ground with a speed of 6,27 m.s1 and is in contact with the ground for 0,2 s during the first bounce. 000 000 3.2.1 Calculate the time t as indicated on the graph. (4) 3.2.2 Determine the velocity with which the ball leaves the ground after the first bounce. (4) 3.2.3 Calculate the magnitude of the force exerted by the ground on the ball during the first bounce. (4)