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Problems from Relativity

A spacecraft starts from earth moving at constant speed to planet A which is 20 lighthour away from Earth. It takes 25 hour (according to an earth observer) for a spacecraft
to reach this planet. Assuming that clocks are synchronized at the beginning of the
journey, compare the time elapsed in the spacecraft frame for this one-way journey with
the time elapsed as measured by an earth-based clock?

Posted by Mahmoud

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