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A water wave oscillates up and down once every 1.50 seconds. The distance between wave crests is 3.80 m. The speed of this wave __ m/s.
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Swimming at 1.50 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 45.0 m downstream from the point directly across the river from his starting point. (a) What is the speed o ...
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