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p=2kW
h=30m
t= 1 min=60s
szukane:
v?
rozwiązanie:
P=W/t // *t
W=P*t
W=Ep
Ep=m*g*h
P*t=m*g*h
m=(P*t)/(g*h)
t=1 min=60 s
m=(2000*60)/(10*30)
m=120 000/300
m=400 kg
V=400 l
mam nadzieje ze dasz mi najj ;p ;*