One 20-year-old twin brother takes a space trip with a speedof 0.80c for 30 year

Question

One 20-year-old twin brother takes a space trip with a speedof 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what ishis own age and the age of the Earth-based twin brother? A) 20; 30 B) 30; 50 C) 50; 70 D) 70; 90 One 20-year-old twin brother takes a space trip with a speedof 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what ishis own age and the age of the Earth-based twin brother? A) 20; 30 B) 30; 50 C) 50; 70 D) 70; 90

Explanation / Answer

B) 30; 50

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