from linear fit(velocity graph) I got slope= 0.01635 Y-Intercept=0.1640 and mean= -0.5049 answer fallowing questions: 1)what is the physical meaning of the y-intercept? 2)what is the purpose of a best fit line and why was it used in tour velocity graph? 3) what is the relationship between the slope of your velocity graph and the glider's mean acceleration within the time interval? why?