On the earth, you are watching a spaceship move directly away from the earth at

Question

On the earth, you are watching a spaceship move directly away from the earth at 0.75c relative to the earth. Q. The proper length of the original spaceship is 100 m (this is the length people on the spaceship measure the length of the spaceship to be). How long do you measure the spaceship to be when it is moving at 0.75c? a) 50 m b) 66 m c) 100 m d) 151 m e) 200 m Q. After a while, you notice 15 minutes have passed on the clocks of the earth (your clocks). How much time do you observe to have elapsed on the clocks of the spaceship? a) 9.92 min b) 11.25 min c) 15 min d) 20 min e) 22.68 min

Explanation / Answer

the length of the spaceship will be 66m

the time have elapsed on the clocks of spaceship=15min

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