Okay, so as Senior Year is rapidly coming to an end, we're all doing projects and such. Our Physics project is to basically prove or disprove the physics of something. I chose Portal 2. Now, I need to find the elasticity of the Repulsion Gel on the ground. I'm trying to use the Hit & Bounce Formula (MV₁O + MV₂O = MV₁F + MV₂F) but A) I can't remember the units elasticity is measured in (I checked Google for all of this by the way and I couldn't find anything) and B) I need to find the elasticity of the ground, not Chell. Any ideas or help would be greatly appreciated.