The 5-lb cylinder is falling from A onto the platform. The maximum displacement of the platform, caused by the collision is 0.3 ft. The spring has an unstretched length of 1.75 ft and is originally kept in compression by the 1-ft long cables attached to the platform. Determine the initial velocity vA when the platform has the maximum displacement. Neglect the mass of the platform and spring and any energy lost during the collision