Trip to distant star that is stationary relative to earth

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A space traveler moving at a speed of 0.56c by respect to the earth makes a trip to a distant star that is stationary relative to the earth. He measures the length of this trip to be 7.9light-years. What would be the length of this similar trip (in light-years) as measured by a traveler moving at a speed of 0.85c by respect to the earth?

Reference no: EM13664528

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