A spaceship has a length of 20 meters at rest and accelerates to high speed. A person at rest on the ground observes that the spaceship has 12 meters. How fast (in x 108m/s) is the spaceship?
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A spaceship has a length of 20 meters at rest and accelerates to high speed. A person at rest on the ground observes that the spaceship has 12 meters. How fast (in x 108m/s) is the spaceship?
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