[tex]Dane:\\v_{o} = 10\frac{m}{s}\\t = 10 \ s\\v = 25\frac{m}{s}\\Szukane:\\a = ?\\\\a = \frac{\Delta v}{t}=\frac{v-v_{o}}{t}\\\\a = \frac{25\frac{m}{s}-10\frac{m}{s}}{10 \ s}\\\\a = \frac{15\frac{m}{s}}{10 \ s}\\\\\boxed{a = 1,5\frac{m}{s^{2}}}[/tex]