The problem is that I have assumed this height-bounce function is linear. I suspect for heights up to 20 meters, it might not be linear. If after each bounce it lost 0.187 meters, then it would just have to be dropped from 75 feet plus 0.187 meters or 23.05 meters. Using the same idea as above, I could calculate the speed needed to go 23.05 meters high instead of 22.86 meters . Only 0.088 m/s faster than to just go up to 75 feet. More important than the video is a plot of the ball’s motion.

I recommend doing it this way instead of gluing directly to the straw, as the heat from the hot glue gun may deform the plastic of the straw. To show ownership of your results and graphs, it’s important to show a sample of the calculations that you have used in your experiment. In this case I have used averages, as well as bounce efficiency calculations. Experiment was repeated for a total of 3 trials per height and recorded in a table with averages calculated. The ball was then dropped and the rebound was measured by eye at approximately 90 degrees to the ruler to minimise parallax errors. # If we bounce with a decent velocity, do a normal bounce.