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The peak of a wave with a wavelength of 624 m, a frequency of 0.05 s-1,...

The peak of a wave with a wavelength of 624 m, a frequency of 0.05 s-1, and traveling in deep water, passes a fixed point P. What is the displacement at P (in terms of the amplitude, (include a drawing to show the position of the wave in each case):

(a) 30 seconds after the peak has passed?

(b) 80 seconds after the peak has passed?

(c) 85 seconds after the peak has passed?

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