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A spaceship is traveling at a speed of 0.720 times the speed of light, as measured...

A spaceship is traveling at a speed of 0.720 times the speed of light, as measured from earth, when it jettisons a load of trash. If the captain of the spaceship sees the trash fall behind the ship at a speed of 0.420 times the speed of light, what speed (as a fraction of c) does an Earth observer measure for the trash?

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