I've just made a simple spring simulation but i've a problem .
I make two particles and i join them by a spring. Suppose the normal length of the spring is 1.0 and the distance between the partcles is 1.5. One of the particle has a 1/Mass = 0.0, non force has effect on it. If i run the simulation the spring must swing around. In my simulation, the spring swings around but the distance between the particle never stop increasing. So where is the problem? If someone can help me, please i don't understand what is the problem.