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F1=400N
F2=600N
r1= 3m
Szukane: r2
Rozw:
F1*r1 = F2*r2
r2 = (F1*r1) / F2
r2 = (400N * 3m) / 600N
r2 = 1200N*m / 600N
r2= 2 m
Odp: Ramie na którym usiądzie musi mieć 2m.