Okay, I'll translate the gist of it for those physicsally challenged
Lynch doesn't have a high top speed, but he has a very fast acceleration, which means he generally hits harder than he's being hit, which allows him to drive his would-be tacklers. One thing this analysis didn't touch on, as it didn't come into play, is that Lynch keeps his feet wider than most running backs, meaning he has a better center of gravity, which means he's harder than most running backs to knock down. Add the two together - fast acceleration so he hits harder and better center of gravity and you've got a guy who gets a lot of yards after contact.