We believe that after a certain number of Mentos added, the spray height will cease to increase and will plateau at which point the amount of kinetic energy will also reach its peak. We believe that this will happen because at some point the addition of the Mentos will become inconsequential as there is not an unlimited amount of CO2 in the Diet Coke. The number of Mentos is the X variable and the height of the spray (defined by the distance in inches the Coke spout reaches above the bottle) is the Y variable. Kinetic Energy is defined as the energy of the spray’s upward motion.