Social Studies, 15.07.2021 17:30 5041
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a spaceship that travels away from Earth at a speed of 0.60c for 10 years (as measured by Courtney). At the end of the trip, Courtney is 20 years old. How old is Andrea
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A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, An...
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