A ball that is bobbing up and down on the end of a spring has a maximum displacement of 3 inches Its motion in ideal conditions is modeled by y cos 20t t 0 where y is measured in feet and it is the time in seconds a Graph the function 3 20 10 20 5 MAA MA MA MA R 5 5 20 10 20 5 b What is the period of the oscillations 201 That s it c Determine the first time the weight passes the point of equilibrium y 0 1