Constant acceleration equations are used to analyze projectile motion and help extract the value of unknown kinematic variables (velocity, distance, and time).
A good source of information can be found in the geometrical proofs given by Newton in his Principia.
For example his first demonstration "On first and last ratios . . " gives the distance (s) going as the duplicate ratio of the time (t^2). ---If I remember aright, Confer :