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Imagine you want to drop a supply package out of a small helicopter. You want to drop it onto a island that is 3 meters wide and you are flying at a height of 20 meters. If you fly straight at the island with a speed of 25 m/s, how big should the distance from you to the far end of the island be to get the best result [get the supply in the middle of the island]? Air-resistance is negligible.
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