[tex]k=500 \ N/kg \\ m=2,5 \ kg \\ g=10 \ N/kg \\ \boxed{F_e-?} \\ \boxed{\Delta l-?} \\ \bold{Rezolvare:} \\ \boxed{k=\frac{F_e}{\Delta l}} \ \ \ \ \ \ \ \boxed{F_e=G=m \cdot g} \\ F_e=G=2,5 \ kg \cdot 10 \ N/kg \\ \Rightarrow \boxed{F_e=25 \ N} \\ \Delta l=\frac{F_e}{k} \\ \Delta l=\frac{25 \ N}{500 \ N/m} \\ \Rightarrow \boxed{\Delta l=0,05 \ m=\boxed{5 \ cm}}[/tex]
