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m - 0,5t = 500kg
h - 20m
p = W / t
W = F * h
F = m * g = 500kg * 10N/kg = 5000N
W = 5000N * 20m = 100000J
P = 100000J / 20s = 5000W
odp: Moc tego silnika to 5000W.