If a body maintains a constant change in its velocity in a given time interval along a straight line, then the body is said to have a Uniform Acceleration.
Equation A: v=d/t
Equation B: vave = vf-vi/2
Equation C: a = vf-vi/t
where:
v = velocity
vf = final velocity
vi = initial velocity
vave = average velocity
d = displacement
t = time
a = acceleration
Equation D: d = (vf + vi/2)t
To find out how displacement changes with time when an object is uniformly accelerated, rearrange equation A to arrive at d = vt. Since the velocity of the object changes when it is uniformly accelerating, we use the average velocity to determine displacement, so substituting v by Vave in equation B