[tex]dane:\\v = 160\frac{km}{h} = 160\cdot\frac{1000 \ m}{3600 \ s} = 44,(4)\frac{m}{s} = 44,4\frac{m}{s}\\a = 0,9\frac{m}{s^{2}}\\szukane:\\t = ?\\\\v = a\cdot t \ \ /:a\\\\t = \frac{v}{a}\\\\t = \frac{44,4\frac{m}{s}}{0,9\frac{m}{s^{2}}}\\\\\underline{t\approx 49,3 \ s}[/tex]