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Interplanetary Travel- Frame of reference

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As measured in Earth's frame of reference, two planets are 436800 km apart. A spaceship flies from one planet to the other with a constant velocity, and the clocks on the ship show that the trip lasts only 1.24 s. How fast (in c) is the ship traveling?

The answer is not .635c

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As we know the velocity of the ship as measured by the Earth's frame must be l₀/t; this is the simple velocity formula, where l₀ is the distance the ship travels as measured by ...

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