1. The problem statement, all variables and given/known data As shown in Figure A, a block of mass m is hanging from a spring attached to the ceiling. As shown in Figure B, two blocks of mass m/2 are hanging from two strings that are attached to a spring that has the same spring constant k. If the spring in Figure A is stretched a distance d, how far will the spring in Figure B stretch? 2. The attempt at a solution The problem (Figure-B)is approached based on identifying that the center of the spring acts like a fixed point and does not shift (because of symmetry). Therefore the problem now breaks down into two equal springs in series. Don't know how to approach from here. After it breaks down into two springs of equal spring constants, I used [itex](k1k2)x/2(k1+k2) = mg/2[/itex] did this for both masses respectively. Not getting me anywhere. Anyone have a different approach or another way to look at this problem?