Question

A starship blasts past the earth at 2.0×108m/s. Just after passing the earth, it fires a laser beam out the back of the starship. With what speed does the laser beam approach the earth?

Answer 1

The speed that the laser beam approaches Earth with is 299792458 m/s

Step-by-step explanation:

The speed of light in any inertial reference frame is always c=299792458 m/s or 3×10⁸ m/s. This is because the speed of light is constant throughout the universe and this was proved in Einstein's theory of general relativity.