Clark N. answered 03/23/19
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asked 03/19/19.. twin brothers A &B are 20 years old.B set out for a journey to Planet X located 20ly from earth B’s spacecraft is moving with a speed of 0.86c relative to Earth.After return journey from Planet X estimate the age of A & B
Clark N. answered 03/23/19
Physics and Mathematics tutor, Harvard-trained with NASA experience
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