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E = ?
v = 180 km/h = 50 m/s
m = 1,5 t = 1500 kg
h = 100m
E = Ek + Em = mv2/2 + mgh
E = 1500*2500/2 + 1 500 000 = 3 375 000 J = 3,375 MJ
2.
P = 12 kW = 12000 W
W = 30 J
t =?
P = W/t
t = W/P = 30/12000 = 0,0025 s