The crew of a spaceship traveling with a velocity of 0.6c relative to the Earth measures the distance between two cities on earth (in a direction parallel to their motion) as 600 km. What is the distance between these two cities as measured by people on Earth? (See table 20.1—which observer measures the rest length?) 

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table 20.1 Values of y for Different Values of Relative Speed v v = 0.010 y = 1.000 05 V V = 0.1c Y = 1.005 Y = 1.155 Y = 1.250 Y = 1.667 V - 0.5c V = 0.6c %3! V = 0.8c V = 0.9c 2.294 V = 0.99c Y = 7.088