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m=70kg
t=8h = 8*3600s
h=2km=2000m
g=10m/s2
Szukane:
P
P = W/t
W=Fh=mgh
P=mgh/t
P=70*10*2000/(8*3600) [kg*N/kg*m/s=Nm/s=J/s=W] = 48,6 W