Two identical 0.4 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, as shown in the upper portion of Figure 9.56. Then a constant...

Two identical 0.4 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, as shown in the upper portion of Figure 9.56. Then a constant force of 100 N to the right is applied to block 2, and at a later time the blocks are in the new positions shown in the lower portion of Figure 9.56. At this final time, the system is moving to the right and also vibrating, and the spring is stretched.