where A is the amplitude of the oscillation, f is the frequency of the
oscillation, and t is time. Take some time now to use Mathematica to generate a
variety of plots for this function for different values of A and f. What
will the two axes of the plot be?

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The horizontal axis will be time measured in seconds, and the vertical axis
will be the vertical position of a fixed point (say, the driver's seat) of the
car. A positive position means that the car has bounced up, and a negative
position means that the car has bounced down.