We're doing a lab that examines the relationship between velocity and distance traveled on an incline plane. The objective was to prove the 3rd kinematic equation and conclude if our results supported or disproved Galileo when he found that acceleration is constant on an incline plane.

I am lost as to how to find my observed and expected acceleration and how this will somehow prove Galileo. Does anyone remember doing such a lab? If you do any help would be appreciated.