As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m, while the captain on board radios that her spaceship's length is 1150 m

(c = 3.00 × 108 m/s)
(a) How fast is the rocket moving relative to Earth?
(b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?


(a) 0.959c = 2.88 × 108 m/s
(b) (i) 6.75 × 1018 J (ii) 2.39 × 1019 J

Physics & Space Science

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