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A
a) W = mgh+ \frac{1}{2} mv^2 = 800kg*14m*9.81ms^{-2}+\frac{1}{2}*800kg*(30m/s)^2 = 469872J
b) \frac{1}{2}mv^2 = \frac{1}{2}*800kg*(30m/s)^2 = 360000J