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s - droga = 20 cm = 0,2 m
W - praca = Fs = 50 razy 0,2 = 10 Nm = 10 J
F=50N
W=F*s=50N*0,2m=10J (dżuli)
s - droga = 20 cm = 0,2 m
W - praca = Fs = 50 razy 0,2 = 10 Nm = 10 J