In the video, I drop a ball off a three-story balcony. We know that objects in freefall follow the equation for height h, in meters, h = – 4.9t² + c, where t is time in seconds, and c is the initial height. A student timed the drop at 1.51 seconds. Use this to determine the height from which the ball was dropped, to at least 2 decimal places.

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.