Physics, 07.06.2020 01:00, kat9940

An earth observer sees an alien ship pass overhead at 0.3c. The ion gun of the alien ship shoots ions straight ahead of the ship at a speed 0.4c relative to the ship. What is the speed of the ions relative to the earth observer?

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An earth observer sees an alien ship pass overhead at 0.3c. The ion gun of the alien ship shoots ion...