Two Stars Are at Rest Relative to Each Other $68.7 \text { light-years }$

question 18

Multiple Choice

Two stars are at rest relative to each other.In their common rest frame,these stars are 90.0 light-years apart.If they are measured to be $68.7 \text { light-years }$ apart by the navigator of a spaceship traveling between them,how fast is the spaceship moving relative to these stars?

• A)0.646c
• B)0.604c
• C)0.558c
• D)0.505c

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