[tex]Dane:\\F_{g} = \frac{3}{4} \ N\cdot3=\frac{9}{4} \ N = 2,25 \ N\\g = 10\frac{N}{kg}\\Szukane:\\m = ?\\\\F_{g} = m\cdot g \ \ /:g\\\\m = \frac{F_{g}}{g}\\\\m = \frac{2,25 \ N}{10\frac{N}{kg}}\\\\\boxed{m = 0,225 \ kg}[/tex]
