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ma prędkość v=90 km/h; f=0,1
równanie sił
F=T+Fo
mgsinα=mgfcosα+Fo
siła oporu
Fo=mg(sinα-fcosα)
Fo=mg(tgα-f)
tg(π/8)=0,4142
Fo= 80*10*(0,4142-0,1)=251,36 N