Two masses m1= 1 kg and m2= 2 kg are connected to each other by a massless rope that passes over a pulley with mass mp= 0.5 kg. The pulley rotates around a frictionless axle and the rope passes over the pulley without slipping. Mass m1 is attached to a vertical wall by a spring with spring constant k = 150 N/m and slides on a frictionless surface. What is the period (in s) ofsmall oscillations of this system?