That is more physics with normal forces and trajectory, which does rely on geometry, but also involves some heavy calculations. I would stick to your basic rotations and trigonometry considering the whole mountain is a slope. In my physics class last semester we had to do a set of "real life" physics problems. Using some simple calculus, I estimated tanner's speed that he hit chads gap at, and how much faster he and his ankles would have had to have been going to clear it. Showed the video too, aced that shit.
Remember when the signatures were the same shade as the posts, and you used to be able to trick people. And if you are reading this, it is my sig.... Those were the days.