Physics relativity 17

Physics
Tutor: None Selected Time limit: 1 Day

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?

Jul 10th, 2015

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0.7c 

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Jul 10th, 2015

how did you get this?

Jul 10th, 2015

speed of bullet wrt observer  - speed of ship wrt to observer  = 0.4c

hence speed of bullet  relative to onserver = (0.4 +0.3 )c = 0.7c (Answer)

Jul 10th, 2015

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