A.
[tex]Dane:\\v_{o} = 0\\t = 10 \ s\\v = 25\frac{m}{s}\\m = 1 \ 500 \ kg\\Szukane:\\F = ?\\\\Rozwiazanie\\\\F = m\cdot a\\\\ale \ \ a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t} = \frac{25\frac{m}{s}}{10 \ s} = 2,5\frac{m}{s^{2}}\\\\F = 1500 \ kg\cdot2,5\frac{m}{s^{2}}\\\\\boxed{F = 3 \ 750 \ N = 3,75 \ kN}\\\\(1 \ kN = 1000 N)[/tex]
B.
[tex]Dane:\\m = 0,5 \ kg\\F = 10 \ N\\Szukane:\\a = ?\\\\Rozwiazanie\\\\a = \frac{F}{m}\\\\a = \frac{10 \ N}{0,5 \ kg} = \frac{10 \ kg\cdot\frac{m}{s^{2}}}{0,5 \ kg}\\\\\boxed{a = 20\frac{m}{s^{2}}}[/tex]
