Hello, I have been turning to this subject and tried to develop the right equation on my own. What I did was: mgh = ½kx2 (fall energy = spring energy) x2 = 2mgh/k (obviously devided by ½k) sqrt(2mgh/k) = x (taking out square root) F = mgh/x = mgh/sqrt(2mgh/k) = sqrt(½mghk) (energy /distance = force) But when I checked the internet for answers it was not the answer given. The correct equation is F = sqrt((mg)2 +2mghk) I definitely went wrong somewhere, could someone please help me understand how that equation was properly developed so that I can understand this. I am sort of embaressed to be mistaken. Thanks in advance. PS: I donno what perfix to put so I put intermediate.