[tex]dane:\\m = 2 \ t = 2 \ 000 \ kg\\t = 15 \ s\\\Delta t = 25\frac{m}{s^{2}}\\szukane:\\F = ?\\\\a = \frac{\Delta v}{t}=\frac{25\frac{m}{s}}{15 \ s} = \frac{5}{3}\frac{m}{s^{2}}\\\\F = m\cdot a\\\\F = 2000 \ kg\cdot\frac{5}{3}\frac{m}{s^{2}}\\\\F = 3 \ 333,3 \ N \approx3,333 \ kN\\\\(1 \ kN = 1000 \ N)[/tex]