Shortest Time Problem
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A dog fetches a ball thrown into a lake. Because the dog swims more slowly than it runs on sand, the shortest time path is not a straight line. You can drag the image of the dog to vary the path.
Contributed by: Oleksandr Pavlyk (March 2011)
Open content licensed under CC BY-NC-SA
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"Shortest Time Problem"
http://demonstrations.wolfram.com/ShortestTimeProblem/
Wolfram Demonstrations Project
Published: March 7 2011