The Concord never got anywhere near the speed of light. Neither did
any rocket ship, space probe, satellite, comet, asteroid, meteor, etc.
As long as the light remains in the motor oil, nothing happens to its speed.
The Concord's speed was 1,176. Faster than the speed of sound
It moves at a slower speed!
The speed decreases.
The speed increases.
I'm afraid nothing happens to the speed of light ever. Also "air" is consider'd a gas.
Concord Point Light was created in 1827.
The crusing speed of the concord jet is Mach 2, or 1,336 mph (2,150 kph).
it travels at c (speed of light in a vacuum)
It increases.
The speed of light IN A VACUUM is always the same. In substances other than the vacuum, the speed of light is usually slower than in a vacuum.
The speed of light decreases when it enters a denser medium and is refracted, such as water or glass. The change in speed causes the light to change direction at the boundary between the two media.