Lets say that
- an airplane can fly at 4/5 of the speed of light, and
- I can run at 2/5 of the speed of light, and
- I'm in the airplane.
Suddenly I start running towards the cockpit down the middle lane. Now what?
From what I know, the speed of light is not the speed of light just because it is. The speed of light is instead the maximum speed limit because light moves as fast as possible and therefore equals the max speed.
But when it's the maximum speed limit, nothing can ever move faster.
So, I'm running in the airplane... now what?