Hi, I'm having a bit of a problem with an experiment I recently did. Basically I had two objects on a pulley (let's say masses M and m, M being the heavier object), at five different heights. I released the objects three times for each height. I then calculated the acceleration for each seperate time. Thus I made fifteen data points (fifteen accelerations for each time interval). Now, here is the problem. I need to set up a graph with fifteen data points, and a slope of g . I already know the value of g(the slope) will NOT be 9.81 m/s^2. According to my data it will be roughly in the range of 8 m/s^2 (estimated). This is due to reaction time and other outside influences distorting the data, since it is not a perfect experiment in ideal conditions. The y-axis must be acceleration, right? What will the x-axis be? I got a hint that it should be (M-m)/(M+m). This seems to be a valid method, because I get a reasonable value dividing acceleration by that. However, I only have those two masses, so if I graph my points I will get a vertical line. The masses do not change, thus the x-axis will only have one value. I obviously need a diagonal line in order to get a slope of g . Basically my big question is, what values do I assign the x-axis in order to get a slope of g ? I have the height, time, final velocity, and acceleration. ANY help would be appreciated!!