An astronaut journeys to a nearby star for 2.5 years according to his clock. When he returns, he finds that 7.5 years have elapsed. What was his speed?    Choices: A. 0.2 c B. 0.45 c C. 0.94 c D. 1.54 c

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter9: Relativity
Section: Chapter Questions
Problem 23P
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An astronaut journeys to a nearby star for 2.5 years according to his clock. When he returns, he finds that 7.5 years have elapsed. What was his speed? 

 

Choices:

A. 0.2 c
B. 0.45 c
C. 0.94 c
D. 1.54 c
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