A asteroid travels at the speed of light.
The light was on in my room.
Speed of light in water = speed of light in vacuum/refractive index of water
Constant is the speed of light and as the speed of light cannot change it is 'constant'
Nothing except electromagnetic radiation uses light speed.
We will need a torch to light our way.
The car with the fastest speed will win the race.
put it in middle like you must speed up or can you speed up please
A light-year is a measure of distance, not of time.
Assuming the speed of light in air is already known (it is close to the speed of light in a vacuum), you might check how the light refracts when it changes from air to water (at what angle), and then use Snell's Law.
The rate of advance is directly related to the speed.
"The maximum speed limit on the freeway is 70mph."
Speed of light