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t1=1h=60'=3600s
t2=1s
v=20l
g=9.81m/s2
d=1kg/l
W=d*v*g*h*t2/t1
W=(w przybliżeniu)=18000000J
F=W/H
F=720000J
P=W/t=F*S/t=F*V
P=5000W
V=P/F
V=0.00694m/s