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A swimming duck paddles the water with i...

A swimming duck paddles the water with its feet once every `1.6` s, producing surface waves with this period. The duck is moving at constant speed in a pond where the speed of surface waves is `0.32 m//s` , and the crests of the waves ahead of the duck are spaced `0.12 m` apart. (a) What is the duck's speed? (b) How far apart are the crests behind the duck?

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