Firstly I know that light has a speed of 299 792 458 m / s. But does it have a velocity. Can this be plotted on graph that is (The velocity)? Next if you derive the formula V2= 2Ek/ m. Where V2 is the velocity squared and Ek is kinetic energy and m is the mass. This is derived from Ek= 1/2 mv2. So if we try to find velocity of a photon then the m would be zero and anything divided by zero is undefined. So why is the velocity of light undefined? V2= 2Ek/ 0= undefined.