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m = 5 kg , h = 40 cm = 0,4 m
W= Ep = mgh = 5 * 10 * 0,4 = 20 J
zad.2
s = 0,8m
W = 120J
W=F*s
F = g*m
W = g*m*s
120 = 10*m*0,8
m = 15kg