Talk:Veritux/@comment-209.65.56.40-20141103022018/@comment-86.75.171.24-20141230020631

Basically, second answer got it right, it's the well-known E = MC² formula, where E is Energy, M is Mass and C is Celerity (meaning Speed).

Here it is all about Kinetic energy because the sword is a solid, kinetic energy is the measure of an impact; it is also used in ballistic to calculate the damage a bullet will inflict depending of its mass and amount of powder (which give speed).