Make sure you did the examples posted over the weekend and then try this worksheet. Section2 should be able to do this. Section 3 here is the information you need:
Theta = omega t use this in all the circular equations for x position, vx, and ax, and they are now the right equations for an oscillator, provided omega = sqrt(k/m) and the radius = A = xmax ( maximum displacement from the equilibrium point x=0).
http://h1.ripway.com/DrCherdack/oscprobA4-09.xls
To find the KE just use mass times v^2/2 and for PE use kx^2/2
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