1. A car on a roller coaster is moving along a level section 12.0 m high at 4.0 m/s when it begins to roll down a slope, as shown in the diagram. Determine the speed of the car at point A. [13m/s] 2. What is the height of point B in the roller coaster track if the speed of the car at that point is 10.0 m/s? [7.7 m] 3. What is the height of y if the speed of the roller coaster at B is 12.5 m/s? [4.8 m]