User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-3146930-20141024021616/@comment-3146930-20141024033953

Ruby very clearly explains that when Yang is hit, she becomes stronger. This theory of it having to do with kinetic energy is mostly a wiki-based idea from what I can tell. Sure she could use that energy to jump higher, but that would still be a result of her boosting her physical strength.