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V = 54 km/h = 54000 m/3600 s = 15 m/s
F = ?
P = W/t
W = F*s
P = F*s/t ; ale s/t = V bo ruch jednostajny
P = F *V
F = P/V
F = 1500 J/s / 15 m/s
F = 100 N
[ J/s / m/s] = [J/s*s/m] = [J/m] = [ N*m/m] = [m]
v= 54km/h=15m/s
P=F*v
F=?
F=P:v
F=1500W:15m/s=100N