Postlab 2 The following questions involve concepts and reasoning similar to those from the prelab. A yo-yo is released from rest and initially moves downward with X increasing speed. When the string comes taut, the yo-yo quickly reverses direction. The yo-yo then moves upward with decreasing speed, returning to the location at which it was originally released. 1. Using a coordinate system in which upward is the positive direction, sketch graphs of position, velocity, and acceleration vs time for the yo-yo. Represent the interval from just after the yo- yo is released to the instant it returns to its starting location. On each graph, mark and label the turnaround point (i.e., the instant the yo-yo is at its lowest point). 2. At its turnaround point, is the direction of the yo-yo's acceleration upward, downward, or zero? Explain your reasoning. a Narrative Reflection As you recall from last week, this part of the lab HW is intended to provide an opportunity for metacognition. You are asked to reflect on how your understanding of the concepts has changed. First, read the sample below. It is intended to be an example of a good narrative reflection. "Learning Target 2 (Analyze the turnaround point of a 1-D motion) is where I made the biggest gains in understanding. I really wasn't sure what the acceleration would be at the bounce. I guessed that the acceleration would be downward because the acceleration before and after is downward because the ball is in free fall. If it is in free fall before and after, wouldn't it be at that moment too? But that didn't account for the upward velocity that occurs just after the ball bounces. I was confused. During lab, I started to understand what actually happens at the momentum of impact. Because of the change in direction from downward to upward, the acceleration must be upward. The Instructor suggested we look at a YouTube video of a golf ball being hit in slow motion, which clarified it further. Now I understand that in the very short amount of time that the ball was in contact with the ground, the acceleration was upward. In fact, we calculated it out to be more than 8g's of acceleration in the upward direction. With this explanation, bouncy balls make a lot more sense to me and I was able to follow the same logic for the post lab question about yo-yos." 3 . Below discuss one strength of this narrative reflection and one way in which it could be improved. (You may wish to look at the grading criteria, found on the course website.)