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P = 4kW = 4000W
P = W/t
t = W/P = (3 * 10⁶)/(4 * 10³) = 750 (s)
Odp. Praca będzie wykonywana 750s.
t= W/P
t= 3000000/4000
t= 750s
Ta praca zostanie wykonana w 750s czyli 12,5min
P - moc = 4 kW = 4000 W
t = W/P = 3000000/4000 = 750 s = 12,5 min