[tex]Dane:\\v_{o} = 0\\t = \frac{1}{2} \ min = \frac{1}{2}\cdot60 \ s = 30 \ s\\v = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\Szukane:\\a=?\\s = ?[/tex]
Rozwiązanie
Przyspieszenie:
[tex]a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} =\frac{v}{t}\\\\a = \frac{20\frac{m}{s}}{30 \ s} =\frac{2}{3} \ \frac{m}{s^{2}}\\\\\boxed{a=0,(6)\frac{m}{s^{2}}\approx0,67\frac{m}{s^{2}}}[/tex]
Droga:
[tex]s = \frac{1}{2}at^{2}\\\\s = \frac{1}{2}\cdot \frac{2}{3}\frac{m}{s^{2}}\cdot(30 \ s)^{2}\\\\\boxed{s = 300 \ m}[/tex]
