The picture above depict two skateboards, with no wheels. Whoops. Anyway, let's pretend there are wheels on the skateboards. They are identical in every way except in that the second one has a mass (15 lbs) on it. If the first skateboard were to roll towards the second (at rest), then after the collision, the first would stop and the second would roll slowly in the same direction the first was moving in. This would be an inelastic collision because they would not stick together when they met. This would be similar to the experiment we conducted this week in our lab.
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