Question 9 (4 marks) golf ball is launched horizontally from the top of a platform that is 10.0 m above ground. The ball strikes aboard 30.0 m away at a position that is 3.0 m above ground. This is shown in Figure 8. 10.0 m 3.0 m - ground Question 8 (5 marks) 30.0 m A pendulum bob of mass 0.200 kg is released from rest and swings in an arc, as shown in Figure 7. The Figure 8 string that connects to the bob and the board above it has an insignificant ma ignificant mass, and no frictional forces exist anywhere during the swing. The bob falls a distance of 0.30 m from its release point to its lowest point. The distance from the centre of mass of the bob along the string to the board is 1.00 m. Determine the amount of time the ball takes to strike the board after being launched. a. Show your working and express your answer to two significant figures. 2 marks 1.00 m 0.30 m pendulum bob Figure 7 Determine the speed at which the ball is launched. Show your working. 2 marks Show that the speed of the bob at its lowest point is 2.42 ms 2 marks 1 mv ? = mah V = 2 X 9 .8 x 0 - 30 = 2.42 m Is ms - Question 10 (6 marks) wo carts, A and B, are connected by a spring and are moving as a unit. Cart A is of mass 1.5 kg. Cart B is of mass 2.5 kg. Cart B has a spring compressed against cart A as they travel at 2.0 m s to the right as a single unit. This is shown in Figure 9a. b. Determine the tension of the string at its lowest position. Show your working. As the carts travel, the spring expands and dislodges the two carts such that cart A continues to travel 3 marks to the right at 1.0 m s , as shown in Figure 9b. F = T - ma 2.0 m s 1.0 m s O A A reellee Figure 9a Figure 9b Determine the speed of cart B after the carts have separated. Show your working. 3 marks N m s