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.
One of the Big List of Topics.
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