Odpowiedź :
[tex]dane:\\F = 2 \ kN = 2\cdot1000 \ N = 2 \ 000 \ N\\a = 5\frac{m}{s^{2}}\\szukane:\\m = ?\\\\Z \ II \ zasady \ dynamiki\\\\a = \frac{F}{m} \ \ \rightarrow \ \ m = \frac{F}{a}\\\\m = \frac{2000 \ N}{5\frac{m}{s^{2}}} = \frac{2000 \ kg\cdot\frac{m}{s^{2}}}{5\frac{m}{s^{2}}} = 400 \ kg[/tex]