[tex]Dane:\\v_{o} = 48\frac{km}{h} = 48\cdot\frac{1000 \ m}{3600 \ s} = \frac{40}{3} \ \frac{m}{s}=13,(3)\frac{m}{s}\approx13,33\frac{m}{s}\\a = 2\frac{m}{s^{2}}\\Szukane:\\t = ?\\\\v = at \ \ /:a\\\\t = \frac{v}{a}\\\\t = \frac{\frac{40}{3}\frac{m}{s}}{2\frac{n}{s^{2}}}\\\\\boxed{t = 6(6) \ s \approx6,7 \ s}[/tex]
