1. The problem statement, all variables and given/known data two linked are attached to each other with a spring. If the second body is placed on a fixed support, the length of the spring is 5 cm. If we fix the first body as in the picture, the length of the spring becomes 15cm. Determine the length of the spring in the non-deformed state. m1 = 1 kg; m2 = 4kg; l1 = 5cm; l2 = 15cm; 2. Relevant equations This time i have really no idea. The m1 pushes the spring with a force of 10N and m2 should like respond with another force? Quite don't get it. 3. The attempt at a solution Any help would be greatly appreciated.