1. The problem statement, all variables and given/known data I was given a chart to figure out the different momentum and kinetic energies of different collisions (elastic and inelastic) and in the lab he posed the question "Calculate the percent elasticity for each of the collisions." 2. Relevant equations conservation of momentum and energy 3. The attempt at a solution I have never heard of this question before and have looked through all of my notes. Finding nothing, I turned to the internet and searched for "percent elasticity," "how to calculate percent elasticity," and multiple other relevant phrases to the problem. Nothing has come up so far and I'm not sure how to approach the question. Any help would be awesome. Thanks!