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(d^2 x(t))/(dt^2) = m(-0.016 x(t)^3-0.8 x(t)^2-9.5 x(t)+6.5), x(0)=-20
(d^2 x(t))/(dt^2) = m(-0.016 x(t)^3-0.8 x(t)^2-9.5 x(t)+6.5), x(0)=-20
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