1.
[tex]dane:\\v_{o} = 0\\t = 10 \ s\\v = 60\frac{km}{h} = 60\cdot\frac{1000 \ m}{3600 \ s} = 16,(6)\frac{m}{s} = 16,7\frac{m}{s}\\szukane:\\a = ?\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t}\\\\a = \frac{16,7\frac{m}{s}}{10 \ s} =1,67\frac{m}{s^{2}}[/tex]
2.
[tex]dane:\\v_{o} = 0\\a = 2\frac{m}{s^{2}}\\t_1 = 30 \ s\\t_2 = 20 \ s\\szukane:\\v_1, v_2 = ?\\\\Rozwiazanie\\\\Dla \ v_{o} = 0\\\\v = a\cdot t\\\\v_1 = a\cdot t_1 = 2\frac{m}{s^{2}}\cdot30 \ s = 60\frac{m}{s}\\\\v_2 = a\cdot t_2 = 2\frac{m}{s^{2}}\cdot 20 \ s = 40\frac{m}{s}[/tex]