1. The problem statement, all variables and given/known data Car 1 (500g) collides with car 2 (500g). The initial velocity of car 2 is 0. The cars stuck together after the collision. I have to come to a conclusion about the results that i got. 2. Relevant equations Kinetic energy before: 0,233 Kinetic energy after: 0,125 Delta kinetic energy: 0,108 3. The attempt at a solution I also calculated delta Ek with an equation. (I will insert a picture) So my conclution is that the energy that is "wasted" is half of the energy that we had in the biginning. I did the same experiment but Car 1 had a mass of 700g and car 2 remained the same. delta kinetic energy was 0,112 which is almost the same as in the first one. So I guess that delta energy is the same no matter how much the cars wheigh. Is my assumption correct? Should I add anything?