1. The problem statement, all variables and given/known data 2 balls, each of mass M, are attached to each other by a spring with constant k. they hanged out by a rope, so they are in equilibrium, the rope was cut and they fall. do they Oscillate? 2. Relevant equations effective g=g-a (vectors) when a=g, effective g=0. Fnet=ma 3. The attempt at a solution now my opinion is split here, from 1 point of view they both fall with acceleration g, so they shouldn't oscillate (that's based on logic) its like throwing a bottle with a hole in it, and no water will come out of the bottle , but on the other hand,the spring was stretched initially, and if m falls with acceleration g, the net force on it should be Fnet=mg, but in this case it's not, the spring is stretched so there is a force upwards(looking at the lower mass) and mg down , so what's the answer, will it? thanks!