[tex]dane:\\v_{o} = 0\\v = 30\frac{km}{h} = 30\cdot\frac{1000 \ m}{3600 \ s} = 8,(3)\frac{m}{s} = 8,3\frac{m}{s}\\g = 10\frac{m}{s^{2}}\\szukane:\\t = ?\\\\v = g\cdot t \ \ /:g\\\\t = \frac{v}{g}\\\\t = \frac{8,3\frac{m}{s}}{10\frac{m}{s^{2}}}\\\\t = 0,83 \ s[/tex]
Odp. Po czasie t = 0,83 s.
