Question: The nearest star to earth is proximal centaury 4.3 light-year away. (a) At what constant velocity must a spacecraft travels from earth id it sit

The nearest star to earth is proximal centaury 4.3 light-year away.
(a) At what constant velocity must a spacecraft travels from earth id it sit i reach the star in 4.0 years, as measured by travels on the spacecraft?
(b) How long does the trip according to earth observers?

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