A plane takes off at St. Louis, flies straight to Denver, and then returns the same way. The plan flies at the same speed with respect to the ground during the flight, and there are no head winds or tail winds. Since the earth revolves around its axis once a day, you might expect that the times for the outbound trip and the return trip differ. However, under the conditions given, the two flight times are identical. Explain why.
Time zones?
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The "same speed" was measured with respect to ground, not some point in space. The ground was rotating with the plane.
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