[tex]Dane:\\v_{o} = 0\\t = 2 \ s\\v = 10\frac{km}{h} = 10\cdot\frac{1000 \ m}{3600 \ s} = 2,(7)\frac{m}{s}\approx2,78\frac{m}{s}\\Szukane:\\a = ?\\s = ?[/tex]
Rozwiązanie
Przyspieszenie:
[tex]a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t}\\\\a \approx \frac{2,78\frac{m}{s}}{2 \ s}\\\\\boxed{a \approx1,39\frac{m}{s^{2}}}[/tex]
Droga:
[tex]s = v_{sr}\cdot t\\\\v_{sr} = \frac{1}{2}(v_{o}+v) = \frac{1}{2}v\\\\s= \frac{1}{2}vt\\\\s \approx\frac{1}{2}\cdot27,78\frac{m}{s}\cdot2 \ s\\\\\boxed{s \approx27,8 \ m}[/tex]
[tex]lub\\\\s = \frac{1}{2}at^{2}}\\\\s\approx\frac{1}{2}\cdot1,39\frac{m}{s^{2}}\cdot(2 \ s)^{2}\\\\s \approx2,8 \ m[/tex]