An armada of spaceships that is 1.80 ly long (in its rest frame) moves with speed...

An armada of spaceships that is 1.80 ly long (in its rest frame) moves with speed 0.750c relative to the ground station in frame S. A messenger travels from the rear of the armada to the front with a speed of 0.960c relative to S. How long does the trip take as measured (a) in the messenger's rest frame, (b) in the armada's rest frame, and (c) by an observer in frame S?

*I mostly need an answer to part C please, I have somewhat of an idea for a and b*

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genius_generous answered 1 year ago

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