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h=10m
W=20000J
m=?
W=Ep=m*g*h
W=m*g*h
m=W/g*h
m=20000J/10m/s²*10m
m=200kg
Odp.Masa tej wody wynosi 200kg
W=mgh
W=20000J * 10m * 10m/s2= 200kg