1.
[tex]dane:\\a = 4\frac{m}{s^{2}}\\F_{c} = 40 \ 000 \ N\\F_{o} = 20 \ 000 \ N\\szukane:\\m = ?\\\\Rozwiazanie\\\\F_{w} = F_{c}-F_{o} = 40 \ 000 \ N - 20 \ 000 \ N = 20 \ 000 \ N\\\\a = \frac{F_{w}}{m} \ \ \rightarrow \ \ m = \frac{F_{w}}{a}\\\\m = \frac{20000 \ N}{4\frac{m}{s^{2}}} = \frac{20000 \ kg\cdot\frac{m}{s^{2}}}{4\frac{m}{s^{2}}} = 5 \ 000 \ kg = 5 \ t[/tex]
2.
[tex]dane:\\m = 1 \ 300 \ kg\\a = 1,5\frac{m}{s^{2}}\\F_{o} = 1 \ 550 \ N\\szukane:\\F_{c} = ?\\\\Rozwiazanie\\\\F_{w} = m\cdot a\\oraz\\F_{w} = F_{c} - F_{o}\\\\F_{c}-F_{o} = m\cdot a\\\\F_{c} = m\cdot a + F_{o}\\\\F_{c} = 1300 \ kg\cdot1,5\frac{m}{s^{2}}+1550 \ N\\\\F_{c} = 1950 \ N + 1550 \ N \\\\F_{c} = 3 \ 500 \ N[/tex]