I am having a problem with this: One end of a light spring with force constant 100N/m is attached to a vertical wall. A light string is tied to the other end of the horizontal spring. The string changes from horizontal to vertical as it passes over a solid pulley of diameter 0.04m. The pulley is free to turn on a fixed smooth axle. The vertical section of the string supports a 0.2kg mass. The string does not slip at its contact with the pulley. Find the frequency of oscillation of the object if the mass of the pulley is a) negligible b) 0.25kg Thank you in advance.