Yeah, it would probably all be turned into heat in a space situation such as the nasa asteroid which is in a vacum, then most of the kinetic motion is turned into thermal excitation, but maybe on earth where there is air which could turn into a massive sound shockwave it maybe a differant case, I wasnt abusing your math though it's pretty spot on, just I wouldnt think that allllll of it would turn into heat (i'm a knit picker, most will though) sorry if I sounded abusive just then.