In their common rest frame,two stars are 90.0 ly apart.If they appear to be 68.7 ly apart to a spaceship,how fast is the spaceship moving? Express your answer in terms of c.

Name: In their common rest frame,two stars are 90.0 ly apart.If they appear to be 68.7 ly apart to a spaceship,how fast is the spaceship moving? Express your answer in terms of c.
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Quizplus · Accepted Answer

The length contraction formula is L = L0 * sqrt(1 - v^2/c^2). Here, L0 = 90.0 ly and L = 68.7 ly. Solving for v, we get v = 0.646 c.

In Their Common Rest Frame,two Stars Are 90