I have a question. If I hang a weight on a spring it will get delta L meters longer. then the weight starts to bounce up and down (the amplitude is y meters). (it was hard to make the upper y distance equal to the y on the bottom but they are supposed to be equal. So my question is: when the spring is in motion, is it possible that it compresses more than delta l? I mean that it will get smaller than it was before the weight.