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a) W = 1/2*k*x^2 and so W = 0.5 * 490[N/m] * (.0515m)^2 = 0.6498 J b) KE = [delta]W = 0.6498KE = 1/2 * m * v^2 rearrange so that v = sqrt(2*KE/m) = sqrt(0.6498[m^2/s^2]) = 0.8061 m/s
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