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v = 54km/h = 15m/s
m = 2kg
h = 80m
E = Ek + Ep
E = 0,5mv^2 + mgh = m(0,5v^2 + hg)
E = 2kg*(0,5*(15m/s)^2 + 80m*10m/s^2) = 1825J