[tex]dane:\\v_{o} = 0\\t = 0,5 \ min = 30 \ s\\v = 36\frac{km}{h} = 36\cdot\frac{1000 \ m}{3600 \ s} = 10\frac{m}{s}\\F = 5 \ N\\szukane:\\m = ?\\\\Rozwiazanie\\\\Z \ II \ zasady \ dynmiki\\\\a = \frac{F}{m} \ \ \rightarrow \ \ m = \frac{F}{a}\\\\a = \frac{\Delta v}{t} = \frac{v}{t} = \frac{10\frac{m}{s}}{30 \ s} = \frac{1}{3}\frac{m}{s^{2}} = \frac{1}{3} \ \frac{N}{kg}\\\\m = \frac{5 \ N}{\frac{1}{3}\frac{N}{kg}} = 15 \ kg[/tex]
Odp. Masa ciała wynosi 15 kg.
