162. Wave motion A buoy oscillates in simple harmonicmotion y = A cos t as waves move past it. The buoy movesa total of 3.5 feet (vertically) from its low point to its highpoint. It returns to its high point every 10 seconds.(a) Write an equation describing the motion of the buoy if itis at its high point at t = 0.(b) Determine the velocity of the buoy as a function of t.

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