Posted by Anonymous on Wednesday, December 19, 2012 at 9:53am.
well, let's see. You are only given two pieces of data, so the manipulation must be simple.
energy(N-m) = N/m * m^2
P.E. = 1/2 kx^2
21 = 1/2 (70000)x^2
x^2 = .0006
x = .0245m or 2.45 cm
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