math

Ooops, indeed. And why I became so absent-minded? Shame on me!

To find c just express it: e=0.5*c*v^2 => 2e = cv^2 => c = v^2/(2e). I guess e isn't the base of natural logarithm, v isn't speed and c isn't the speed of light?

e=0.5*c*v^2 => 2e = cv^2 => c = 2e/ v^2