A spring has an unstretched length of L0= 0.40 m. A block with mass M= 0.4 kg is hung at rest from the spring, and the spring becomes L1= 0.45 m long. Next the spring is stretched to a length of L2= 0.49 m and the block is released from rest. Air resistance is negligible.

\fA spring has an unstretched length of Lo = 0.40 m. A block with mass M = 0.4 kg is hung at rest from the spring, and the spring becomes L1 = 0.45 m long (see figure). Next the spring is stretched to a length of L2 = 0.49 m and the block is released from rest. Air resistance is negligible. L M