One end of a spring is fastened securely to the ceiling. A block is attached to the other end of the spring. When this system is in equilibrium, the spring is oriented vertically and the block is at rest. A student pulls the block down several cm below this equilibrium position and releases it from rest. The system is observed to bob up and down, undergoing a smooth, repeating motion about the equilibrium. 1. In the space provided, sketch a position vs time graph to represent this motion. Use a coordinate system with the origin at the equilibrium position and the positive direction position upward. Let t = 0 represent the instant at which the block is released. time 2. Mark and label the following on your graph: i. The instant at which the block reaches the equilibrium position. ii. The instant at which the block reaches a high point. iii. The instant at which the block returns to the position from which it was released. 3. Consider an instant during the bobbing motion at which the block is at a high point. At this instant, . is the acceleration of the block upward, downward, or zero? Explain. . is the net force on the block upward, downward, or zero? Explain 4. Consider an instant during the bobbing motion at which the block is at a low point. At this instant, . is the acceleration upward, downward, or zero? Explain. . is the net force on the block upward, downward, or zero? Explain 5. Consider an instant at which the block is at its equilibrium position. At this instant, . is the acceleration upward, downward, or zero? Explain. . is the net force on the block upward, downward, or zero? Explain. Instructor initials for annotated prelab