Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past her at just 1000 km/s.
B) the laser beam moves past her at 300,000 km/s.
C) Both of the above.
D) the laser beam never catches up with her.
E) Mort has turned into a giant frog.

Question

Quizplus · Accepted Answer

According to the theory of relativity, the speed of light is constant for all observers, regardless of their relative motion. Therefore, Velma will observe the laser beam moving past her at the speed of light, 300,000 km/s.

Mort Stands on Earth