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The nearest star to Earth is Proxima Centauri, 4.3 light-years away. A: At what constant velocity...

The nearest star to Earth is Proxima Centauri, 4.3 light-years away.

A:

At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 5.5 years, as measured by travelers on the spacecraft?

B:

How long does the trip take according to Earth observers?

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