so far what i've learned is that in any frame of reference light in a vacume travels at the same speed... C

the equation explaining relative motion is given as this

v<sub>xz</sub> = (v<sub>xy</sub>+v<sub>yz</sub>)/[1+(v<sub>xy</sub>v<sub>yz</sub>/c<sup>2</sup>)]

v = v<sub>xy</sub>

u = v<sub>yz</sub>

w = v<sub>xz</sub>

but what happens when you want to find velocity of light in a frame of reference moving at the speed of light?

v = c

u = c-h

where h is equal to zero, you end up with

w = (h/h)c or (0/0)c

What is the velocity of light relative to itself? Is it zero, or does it remain the speed of light?

If you have a car that is accelerating its speed closer and closer to the speed of light, the light comming from its headlights will continue moving away from it at the speed of light. But if you were to actualy reach the speed of light, would the light suddenly become motionless to you?