1.
[tex]Dane:\\v_{o} = 0\\t = 10 \ s\\v = 50\frac{km}{h} = 50\cdot\frac{1000 \ m}{3600 \ s} = 13,(8)\frac{m}{s}\approx13,9\frac{m}{s}\\Szukane:\\a = ?\\\\Rozwiazanie\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t}\\\\a = \frac{13,9\frac{m}{s}}{10 \ s}\\\\\boxed{a = 1,39\frac{m}{s^{2}}}[/tex]
2.
[tex]Dane:\\v_{o} = 0\\t = 3 \ s\\a = 5\frac{m}{s^{2}}\\Szukane:\\v = ?\\\\Rozwiazanie\\\\v = a\cdot t\\\\v = 5\frac{m}{s^{2}}\cdot3 \ s\\\\\boxed{v = 15\frac{m}{s}}[/tex]
