4. Comments and a Final Question [2 points]: The motion of the glider is a bit different than the motion of the puck in Experiment 1. The glider's motion shows a socalled turning point: after separating from hand, the glider is first seen slowing down to a full stop, and then speeding up in the opposite direction. Nevertheless, its acceleration came out to be constant and negative during the entire motion. Why is the acceleration negative all the time, during both slowing down and speeding up? Shouldn't the acceleration be negative when the glider is slowing down, and positive when it's speeding up? [Note: There is another example of a motion with constant acceleration and with a turning point it is the up and down motion of an object thrown upwards and moving only.r under the action of Earth's gravity. This motion is also a topic of Chapter 2 and will be the subject of the next lab activity.]