Speed of light
Suppose that a motorcyclist moving with a speed turns on a beam of light that moves away from him with a speed of in the same direction as the moving motorcycle. What would the stationary observer measure for the speed of the beam of light?
Note: is the velocity of light in vacuum.
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"thou shalt not add my light to the speed of light" ........Speed of light is constant throughout the universe for all observer. Position and velocity are relative but distance and speed of light(c) is absolute.