Stone The Crow

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A child throws a stone at a crow that's sitting on a flagpole. At the instant the stone is released the crow flies horizontally away at 1 m/s. The stone passes through where the crow had been, rises to twice the height of the flagpole, and hits the crow on the way down. What is the horizontal speed of the stone?

Yes, you have enough information. No, you don't need to do pages of algebra, even though I did when I first met this question.

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