I’m trying to derive an equation that provides a mathematical definition of time. The following equation is for the kinetic energy of a body moving at a substantial portion of the speed of light.

Whereeis kinetic energy,mis mass,cis the speed of light, andvis velocity. In the above equation,

v = d/t

Wheredis distance andtis time. Substitutingd/tforvin the first equation, we have

The problem is, solve the last equation fort. Does anyone have the mathematical chops to do this?