You are watching a National Geographic Special on television. One segment of the program is about archerfish which inhabit streams in southeast Asia. This fish actually spits drops of water at insects to knock them into the water so it can eat them. The commentator states that the archerfish keeps its mouth at the surface of the pond and squirts a jet of water from its mouth at a speed of 4 m/s. You watch an archerfish shoot a juicy mosquito off a leaf and into the stream. You estimate that the leaf was about 3/4 of a meter above the stream. You wonder at what minimum angle from the horizontal must the fish shoot a water droplet in order to hit the mosquito. Since you have time during the commercial break, you quickly calculate this angle using conservation of energy.
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