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Harold stands over a well that sits 1.5m above ground level, and throws a stone directly...

Harold stands over a well that sits 1.5m above ground level, and throws a stone directly upward at 8 m/s and moves out of the way. He hears the sound of the stone hitting water 4.2 seconds after originally throwing it upward. Ignoring time required for sound to travel back up the well, how deep is the water level in the well?

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