A weight is suspended from a spring is set into oscillating
motion by compressing it into a point 3 cm above its resting
position and releasing it. It will displace 3 cm past its resting
point. From the time it is released it will bounce at a rate of 3
cycles per second.

a. Draw a graphical representation and give the equation
involving the situation.

b. What is the displacement of the spring after 2.5
seconds?