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2010-04-01T22:25:49+02:00
Dane:
P = 20000W
m = 1000kg
t = 10s

a) P = W/t
W = P*t = 20000W * 10s = 200000J
b) F = m*g = 1000kg * 10N/kg = 10000N
c) Ep = m*g*h
Ep=W
W = m*g*h
h = W/mg = 200000J/10000N = 20m