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Twins were separated at birth with one being taken away by a spaceship moving at a constant speed v and the other being left on

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Twins were separated at birth with one being taken away by a spaceship moving at a constant speed v and the other being left on Earth. When the spaceship finally returned to Earth, one of the twins was twice as old as the other. How fast was the ship moving? c = speed of light. O 0.75c O 0.1c O 0.87c O 0.5c O 0.63c

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