Answer to Question #317789 in Mechanics | Relativity for Andrea

Question #317789

In a terrestrial frame of reference, a star is 56 light-years away. How fast would a person have to travel so that the distance to him is only 35 light-years?

Expert's answer

"v=c\\sqrt{1-\\frac {l^2}{l_0^2}}=0.78c."

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