The acceleration of a body is said to be uniform if its velocity changes by equal amounts in equal intervals of time .
Example:
Free falling of an object.
Consider a body moving along a straight line, and let the velocity at a point 0 be 10, when the stop watch started, the velocity of the body is found to be 12 ,14 ,16 and 18, while at A, B, C, and D at time 1,2,3 and 4 seconds respectively.
It is clear that in each interval of 1s the velocity changes by 2 .
Such a body is said to be in uniform acceleration.