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A 0.700 kg wood block is firmly attached to a very light horizontal spring (k = 200 N/m) as shown in the figure (Intro 1 figure) . This block-spring system, when compressed 4.7 cm and released, stretches out 2.5 cm beyond the equilibrium position before stopping and turning back.

What is the coefficient of kinetic friction between the block and the table?

I just can't seem to find the correct equation.

I know that it involves 1/2kx^2. I am just not sure how to find the uk using that.

Any bit of help is greatly appreciated.