1. The problem statement, all variables and given/known data : In case anyone didn't get a clear picture, in a nutshell the experiment involves us releasing a glider down an air track within a fixed distance x, where the time, t taken is then recorded down. Sorry for not mentioning this before if it's of any use. To determine the acceleration due to gravity on an air track, Note that distance, x is the ordinate and t^2 is the abscissa. variables: manipulated: distance, x(m) responding: time (t^2) constant: mass of the glider, angle of inclination of the air track samples of the data obtained (respectively): x = 0.25; 0.50; 0.75... ; 1.75 t^2= 7.0225; 13.3590; 21.8089... ; 49.2120 height, h= 0.29m; total distance of the track, d=1.9834m 2. Relevant equations x= (at^2)/2, therefore a= 2m; m=slope g= a/sin Ө; sin Ө=0.29/1.9834= 0.1462 3. The attempt at a solution Via linear least square fit, I got slope, m= 0.03498 m/s^2 therefore, acceleration, a= 2m= 0.06996 m/s^2 therefore logically g= (0.06996/0.1462) m/s^2 g= 0.4785 m/s^2 ...? That doesn't make sense. but if we reverse the equation with g= 9.80 then a= 9.80 (0.1462)= 1.43276 m/s^-2 However, the data derived acceleration doesn't come any closer to that value. So it's either the experiment gone wrong or I miscalculated something somewhere; I have informed my other partners to ask whether they can calculate the final answer but I've received no reply yet. I would appreciate it so much if someone can pin point a possible error? Currently running on low battery now. Going to sleep and then go over the whole thing when I wake up. Thanks.