[tex]dane:\\v_{o} = 0\\v = 9\frac{km}{h} = 9\cdot\frac{1000 \ m}{3600 \ s} = 2,5\frac{m}{s}\\g = 10\frac{m}{s^{2}}\\szukane:\\t = ?\\\\Rozwiazanie\\\\dla \ \ v_{o} = 0\\\\v = g\cdot t \ \ /:g\\\\t = \frac{v}{g}\\\\t = \frac{2,5\frac{m}{s}}{10\frac{m}{s^{2}}}\\\\t = 0,25 \ s[/tex]
Odp. Po czasie 0,25 s.
