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John, in his spaceship, observes as Sally, in her spaceship, passed him at the speed of v=0.8c. According to Sally, how fast is John moving?

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Skip to main content# John, in his spaceship, observes as Sally, in her spaceship, passed him at the speed of v=0.8c. According to Sally, how fast is John moving?

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Question

John, in his spaceship, observes as Sally, in her spaceship, passed him at the speed of v=0.8c. According to Sally, how fast is John moving?

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Step by stepSolved in 2 steps