I plotted the distance in cm ( y2-y1) versus the average change in time squared. (This had to be done by hand...) Then I had to find the slope and the y-intercept. Then I was asked to, " ... From your slope, find the magnitude of the acceleration due to gravity (g)" .... I am really confused as to where am I supposed to plug the value of the SLOPE in this equation: change in y=-1/2g(t)^2 >>>> yf-yi=-1/2g(t2-t1)^2 I also don't understand why I wrote down y=mx+o -- something about velocity being zero I know it's really simple but for some reason I am just not getting it. This isn't really homework, it's a lab calculation. I apologize if this question classifies as a "homework question"