Problem 14.80 Part A The spring has a stiffness k = 50 N/m and an unstretched length of 0.3 m. It is attached to the 2.8-kg smooth collar and the collar is released from rest at A (0). The motion occurs in the horizontal plane. Neglect the size of the collar. (Figure 1) Determine the speed of the collar when 0 = 60. Express your answer to three significant figures and include the appropriate units. Figure x 2 m Z k=50 N/m 1 of 1 uA ? v = Value Units Submit Request Answer Provide Feedback