1. The problem statement, all variables and given/known data My group and I have been tasked with choosing a string length so that a mass attached to two springs and the string, dropped from 4.29 meters, will fall within 25 cm of the ground. On the day of the drop we will be given the mass. We will use two springs that we already have and within ten minutes before the drop, must calculate the correct string length. Constants: Mass drop height the two springs (although the order in which they are used can be changed, we have taken data on both combinations) *The only thing we can change is the length of the string from which the two springs and mass are hanging. 2. Relevant equations Hooke's Law: k= mg/x x = √(2U/k) * U is the spring's potential energy u = .5kx^2 3. The attempt at a solution The data we have taken so far as well as the calculated spring constants are in this google document. https://docs.google.com/spreadsheet/ccc?key=0AlOf8KvTeCTrdHBxaldGXzB6WWo5RXVSbTAzTmt5VUE [Broken] With the information we have now we can predict the stretch of a stationary spring. However, we cannot figure out how to predict the stretch when taking into account the force generated by the mass' fall from 4.29 m. We would very much appreciate it if someone could simply point us in the right direction on how to go about this, we've kind of been thrown in the deep end. Thanks.