World Science Scholars
40.4 The Twins Communicate: Quantitative

The Twins Communicate, Quantitative—Problem 1

Gracie heads off into space at $v = {99 \over 101} c$ and, according to George who remains back on Earth, she travels 99 light-years away, turns around and heads back home at $v = {99 \over 101} c$. During the entire journey, George sends out a flash toward Gracie once every year and Gracie sends out a flash toward George once a year.

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