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67. W O A roller coaster rolls on a track as shown in . Fig. 5.29. If the speed of the roller coaster at point A is 5.0 m/s, (a) what is its speed at point B? (b) Will it reach point C? (c) What speed at A is required for the roller coaster to reach point C? 5.0 m/s 8.0 m A 5.0 m B. FIGURE 5.29 Enough energy? See Exercise 67. 68. WW A simple pendulum has a length of 0.75 m and a bob whose mass is 0.15 kg. The bob is released from an angle of 25 relative to a vertical reference line (. Fig. 5.30). (a) Show that the vertical height of the bob when released is h = L(1 - cos 259). (b) What is the kinetic energy of the bob when the string is at an angle of 9.0? (c) What is the speed of the bob at the bottom of the swing? (Neglect friction and the mass of the string.) 0 = 25 L y=0 m