[tex]Dane:\\v_{o} = 0\\t = 10 \ s\\v = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\m = 70 \ kg\\Szukane:\\F = ?[/tex]
Z II zasady dynamiki Newtona:
[tex]a = \frac{F}{m} \ \ \rightarrow \ \ F =a\cdot m\\\\ale\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t} = \frac{20\frac{m}{s}}{10 \ s} = 2\frac{m}{s^{2}}\\\\F = 70 \ kg\cdot2\frac{m}{s^{2}}\\\\\boxed{F = 140 \ N}[/tex]
