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h=6m
P=500W
t=1min=60s
m=?
W=m*g*h
P=W/t
P=m*g*h/t
P*t=m*g*h
(P*t)/(g*h)=m
m=(P*t)/(g*h)
m=(500W*60s)/(10m/s2*6m)
m=500kg
Odp.Pompa wyciągnie 500kg wody.