I am doing a lab in my senior physics class (IB HL Physics 3-4) and I am very confused about a relationship that I found. For my experiment I dropped a racquetball from different heights and then used video analysis to find the height of the ball on its final bounce. I used this data to calculate the initial and final gravitational potential energy and then found the difference between these value to find the energy lost during the ball's bouncing. I graphed the initial height (x) and the difference in energy (y). I had a perfectly linearly correlated graph (r value of 1) with an equation of E=0.379h-0.006. Because the equation is so correlated I feel like there must be a relationship between these two variables, but I am yet to find it. Can anyone help with this? Thank you!