One dimensional motion

By one dimension we mean that the body is moving only in one plane and in a straight line. Like if we roll a marble on a flat table, and if we roll it in a straight line (not easy!), then it would be undergoing one-dimensional motion.
There are four variables which put together in an equation can describe this motion. These are Initial Velocity (vi); Final Velocity (vf), Acceleration (a), Distance Traveled (s) and Time elapsed (t). The equations which tell us the relationship between these variables are as given below.
vf = vi + at
vf2 = (vi)2 + 2as
x = (vi)t + 1/2 at2
average velocity = (vf + vi)/2