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t=4h=240 s
w=2 T
szukane;
P=?
wzor;
p=w przez t
m = 2 t = 2000 kg
t = 4 h = 4*3600 s = 14400 s
g = 10 m/s^2
P = ?
P = W/t
W = F*s
P = F*s/t
F = m*g
P = m*g*s/t
P = 2000 kg * 10 m/s^2*1,8 m*/14400 s
P = 36000 J/14400s
P = 2,5 W