Question

am nevoie urgent că am test va rog ajutama dau coroană

Answer 1

   
[tex]\displaystyle\\ \text{Energia potentiala inmagazinata in resort este: }\\\\ E_p = \frac{kx^2}{2} \text{unde" }\\ E_p=14,4~J = \text{energia potentiala inmagazinata in resort.}\\ k = 20~ \frac{N}{m}= \text{constanta elastica a resortului.} \\ x = ? \text{ arata cu cat trebuie alungit resortul.} \\\\ \text{Rezolvare: }\\\\ E_p = \frac{kx^2}{2}\\\\ 14,4 = \frac{20x^2}{2}\\\\ 14,4 = 10x^2~~~\Big|: 10\\\\ 1,44 = x^2\\\\ x^2 = 1,44\\\\ x= \sqrt{1,44}\\\\ \boxed{\bf x = 1,2~m } [/tex]