If you drop an object through a hole in the Earth stretching from the North Pole to the South Pole, it would oscillate back and forth about 17 times per daypic.twitter.com/crCfBFK2qp
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If I dropped an object in such a hole, it would rattle back and forth against the sides and eventually stop.
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the "drop" would have to be perfect in that there is zero acceleration toward the Earth.
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