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W= 180000 J
t= 60 s
P= 2000 W .
2.
W= F *s
s= W/F
20 kJ = 20000 J
s= 20000 / 400 = 50m
odp1. Moc wynosi 2000 watów
odp2. Przemieszczenie (wysokość) to 50 metrów