Someone in Earth's Rest Frame Says That a Spaceship's Trip $5.78 \mathrm { y }$

question 105

Multiple Choice

Someone in Earth's rest frame says that a spaceship's trip between two planets took 10.0 y, while an astronaut on the space ship says that the trip took $5.78 \mathrm { y }$ What is the speed of the spaceship, assuming the planets are at essentially at rest?

• A) 0.816 c
• B) 0.735 c
• C) 0.975 c
• D) 0.384 c

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