A group of Yale physics students used a video camera to analyze the motion of a ball as it fell. The ball was positioned in front of a large measuring scale so its height above the ground could easily be determined. The students reviewed the video of the falling ball frame-by-frame. They used the scale in the background and the video's timecode to study the motion. The following graph shows the expected behavior of a ball in free-fall (neglecting air drag):
This graph show's the actual behavior of the falling ball:
Notice that the second graph is noticeably different from the first one--apparently, the ball did not fall as an object in free-fall!
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