A very fast-moving train car passes you, moving to the
Chapter 27, Problem 42GP(choose chapter or problem)
Problem 42GP
A very fast-moving train car passes you, moving to the right at 0.50c. You measure its length to be 12 m. Your friend David flies past you to the right at a speed relative to you of 0.80c. How long does David measure the train car to be?
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