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m=1000[kg]
V=72[km/h] = 20m/s
g=10m/s]
szukane
w=?
wzory
Ek=mv²/2
Ep=mgh
h=V*t
W=F*h
F=m*g
Rozwiązanie
Ek=Ep
mv²/2=mgh /m
V²/2=gh/*2
V²=2gh /2g
h = 400/2*10
h = 20[m]
F=m*g
F=1000[kg] * 10[m/s]
F=10000{N}
W=F*h
W=10000[N] * 20[m]
W=200000[J]