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dane t=1h = 3600s, t1=1s, V=20l, d=1kg/l, g=10m/s2=10N/kg, h=25m
szukane W
W = P*t.............P = Ep/t1.....Ep=mgh.....m=d*V......P=dVgh/t1
W = dVght/t1 = 1kg/l*20l*25m*10N/kg*3600s/1s = 18 000 000 J = 18 MJ
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