Extracted text: The 2.8-lb collar is released from rest at A and slides freely down the inclined rod. If the spring constant k = 0.8 lb/ft and the unstretched length of the spring is 30 in., determine the speed of the collar as it passes point B. 39" 2.8 lb 21" 30 " Part 1 Calculate the potential energy in the spring when the collar is at A. Answer: VspA ft-lb i