[tex]Dane:\\v_{o} = 0\\\\a = 1,5\frac{m}{s^{2}}\\v = 54\frac{km}{h} = 54\cdot\frac{1000 \ m}{3600 \ s} = 15\frac{m}{s}\\Szukane:\\t = ?\\\\Dla \ \ v_{o} = 0\\\\v = a\cdot t \ \ /:a\\\\t = \frac{v}{a}\\\\t = \frac{15\frac{m}{s}}{1,5\frac{m}{s^{2}}}\\\\\boxed{t = 10 \ s}[/tex]
Odp. Po czasie t = 10 s.
