Multiple Choice
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?
A) 12 years
B) 10 years
C) 20 years
D) 18 years
Correct Answer:
Verified
Correct Answer:
Verified
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