In the graph, the dotted line represents the potential energy of the car and the solid line represents its kinetic energy. a car is traveling down the highway and is pulled over by police officer, predict what changes must be made to the graph to reflect this situation. a) the dotted line would need to be vertical for a certain amount of time. b) the solid line would need to become horizontal for a certain amount of time. c) the solid line would need to reach zero on the y-axis at some point. d) the dotted line would need to reach zero on the y-axis at some point.