[almostbusto]

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Final velocity relative to what?

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0m/s relative to any other object near the earths surface also traveling at 100m/s in the same direction at that instant of time.

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Not to be too nitty (that is to say, just for the sake of being a supernit), but since the Earth is a sphere, nearly every object traveling in the same direction as the object in question (toward the center of the earth) at 100m/s is going to be moving relative to the original object.

Damn. Making statements that people can't nit into oblivion is tough. I'm so glad I was never so masochistic as to become a middle school teacher.

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the earth is an oblate spheroid, [censored].