[tex]dane:\\F_1 =200 \ N\\S_1 = 5 \ cm^{2}\\m_2= 3 \ t = 3 \ 000 \ kg\\g = 10\frac{N}{kg}\\szukane:\\S_2 = ?\\\\Rozwiazanie\\\\\frac{F_1}{S_1} = \frac{F_2}{S_2} \\\\F_1\cdot S_2 = F_2 \cdot S_1 \ \ /:F_1\\\\S_2 = \frac{F_2}{F_1} \cdot S_1\\\\F_2 = m_2\cdot g = 3000 \ kg\cdot10\frac{N}{kg} = 30 \ 000 \ N\\\\S_2 = \frac{30000 \ N}{200 \ N}\cdot 5 \ cm^{2} = 150\cdot5 \ cm^{2}\\\\S_2 = 750 \ cm^{2}[/tex]
