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m*x''(t) = -k*y'(t), m*y''(t) = k*x'(t) - m*g, x(0)=0, y(0)=0, x'(0)=0, y'(0)=0
m*x''(t) = -k*y'(t), m*y''(t) = k*x'(t) - m*g, x(0)=0, y(0)=0, x'(0)=0, y'(0)=0
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