1. The problem statement, all variables and given/known data Hi, i need to write the differencial force equation for the system attached, and i am not sure if what i do is right. when: F- externa power m1,m2 - mass x1,x2 - mas location 3. The attempt at a solution This is what i got: for m1: F-k*(x1-x2)-D*(x1'-x2')=m*x1'' for m2: k*(x1-x2)+D*(x1'-x2')=m*x2' what do you think? thanks!