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Classical Mechanics

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Moderate

Speed of a Boat Relative to a River Bank

CLMECH-43TPET

You are sitting on a river bank. You notice that a tree trunk floats down the river at 10 m/s. You then see a boat go by downstream at a full throttle. You determine that the boat's speed with respect to you is 28 m/s. The boat then turns around and starts going up the stream at the full throttle.