solve 1.3*10^6 = \dfrac{\frac{1}{2}m*v^2-\frac{1}{2}m*5.2^2}{5.9*60}, m = 1469870.23solve 1.3*10^6 = \dfrac{\frac{1}{2}m*v^2-\frac{1}{2}m*5.2^2}{5.9*60}, m = 1469870.23

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