Odpowiedź :
[tex]dane:\\v_1 = 10\frac{m}{s}\\t = 4 \ s\\v_2 = 30\frac{m}{s}\\szukane:\\a = ?\\\\Rozwizanie\\\\a = \frac{\Delta v}{t} = \frac{v_2-v_1}{t}\\\\a = \frac{30\frac{m}{s}-10\frac{m}{s}}{4 \ s} = \frac{20\frac{m}{s}}{4 \ s} = 5\frac{m}{s^{2}}[/tex]