How fast must a spacecraft travel relative to the earth, Physics

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How fast must a spacecraft travel relative to the earth for each day on the spacecraft to correspond to 2d on the earth?

By standard equation, for the time t to the earth to correspond to double the time t0 elapsed on ship's clock,

1502_standard equation.png

Therefore u =(√3/2) c = 2.60 x 108 m/s relating three important figures.


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