What is happening between points a-b? a. point a and point b are examples of potential energy, there is not energy transformation taking place here. b. point a and point b are examples of kinetic energy, there is not energy transformation taking place here. c. point a is demonstrating kinetic energy, as the roller coaster moves downhill the kinetic energy is transformed into potential energy. d. point a is demonstrating potential energy, the potential energy is then transformed into kinetic energy as the coaster moves downhill.