Calculate the amount of kinetic energy lost ( mgh ) upon each bounce and the percent. 3. Where is the lost kinetic energy? Is bouncing elastic or inelastic for this lab? 4. Suggest a formula for e using the heights of drop and return; then verify it for one of your trials. 5. Estimate the e for a golf ball, tennis ball, and one other ball using your equation for heights of drop and return. 6. For a perfectly elastic collision what is e? 7. On your graph, sketch a line for a perfectly elastic collision and one that is totally inelastic