[tex]dane:\\v = 36\frac{km}{h} = 36\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\T = 12,56 \ s\\szukane:\\r = ?\\\\Rozwiazanie\\\\v = \frac{2\pi r}{T} \ \ /\cdot T\\\\2\pi r = v\cdot T \ \ /:2\pi\\\\r = \frac{v\cdot T}{2\pi}\\\\r = \frac{10\frac{m}{s}\cdot12,56 \ s}{2\cdot3,14}=\frac{125,6 \ m}{6,28}\\\\r = 20 \ m[/tex]
