I tried to work out this problem a few different ways but I never get the right answer. A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 8.00 cm What is the oscillation frequency of the two-block system? What I've done so far: Attempt 1: (Fnet)y=-ky 2mg=-ky m=((-ky)/(2g)) Then using T=2pi times sqaure root[m/k] puting in my m as what I found in terms of k, y, and g. The K's cancel and I am left with things I know and then calculate to find my T it turns out to be 0.40 seconds and then I finish off my problem with freqency= 1/period and get 2.5 Hz But this is incorrect. I probably made a wrong assumption but I can't put my finger on it. I hope someone can put me on the right track. Thank you.