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A free floating sign has been seen on a wave in a sea. It was noticed moving up and down 45 times every 5

A free floating sign has been seen on a wave in a sea. It was noticed moving up and down 45 times every 5 minutes. The long of the sea wave was roughly measured as 2.1 m. Find the time need by the floating sign for going one time up and down, the velocity of the ocean wave and the wave function at maximum displacement of 2.25 m.

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