The pilot of a space ship shines a laser pointer from the back of the ship to the front. The laser travels at the speed of light 300,000 km/s with respect to the ship, which is itself moving at 100,000 km/s.  What will be the speed of the laser beam according to an observer at rest  outside the ship? Express your answer in km/s

Modern Physics
3rd Edition
ISBN:9781111794378
Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Chapter1: Relativity I
Section: Chapter Questions
Problem 2Q: A spaceship in the shape of a sphere moves past an observer on Earth with a speed of 0.5c. What...
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The pilot of a space ship shines a laser pointer from the back of the ship to the front. The laser travels at the speed of light 300,000 km/s with respect to the ship, which is itself moving at 100,000 km/s. 

What will be the speed of the laser beam according to an observer at rest  outside the ship? Express your answer in km/s

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