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X=a*cos (omega*t)

omega =2pi*frequency = sqrot k/m

x=mg/k which came from kx=mg

I got k=7.569 from omega=sqrt m/k, then I plugged k into kx=mg and got x=1.165

from here I would like to use well...im unsure. is the total energy equal to 1/2kx^2 because I have x and k if they are correct.