Please show work and explain. Answer is already given. Thank You. On the earth,

Question

Please show work and explain. Answer is already given. Thank You. On the earth, you are watching a spaceship move directly away from the earth at 0.8c relative to the earth. While moving at 0.8c away from earth it sends a smaller ship back towards the earth at 0.9c (relative to the spaceship). How fast do you (an observer on earth) measure the smaller ship to be moving? 0c 0.1c 0.36c 0.72c 1.7c 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 0.8c? 60 m 80 m 100 m 125 m 167 m After a while, you notice 15 minutes have passed on the clocks of the earth. How much time do you observe to have elapsed on the clocks of the spaceship? 9 min 12 min 15 min 19 min 25 min

Explanation / Answer

C

D

B

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