How can I find the velocity of an object given the time elapsed of trip from the frame of reference of the object and the distance from the frame of reference of Earth.
closed as unclear what you're asking by CuriousOne, Qmechanic♦ Jul 24 '16 at 9:52
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So you have proper time and proper length. Use rapidity, $\eta$. For proper length $x$ and proper time $\tau$-
From this you can calculate the velocity $\equiv dx/dt$