1. The problem statement, all variables and given/known data Find the period of low-amplitude vertical vibrations of the system shown. The mass of the block is m. The pulley hangs from the ceiling on a spring with a force constant k. The block hangs from an ideal string. http://www.luiseduardo.com.br/undulating/SHM/shmproblems_arquivos/image105.jpg [Broken] 2. Relevant equations Fel = K.x Fr = m.a 3. The attempt at a solution Hello, This kind of problem is difficult for me, because I don't understand very well the "geometry" of the problem. When the block falls a distance "x", what is the compression of the spring? Please, could anyone help me ? Thanks.