If the velocity of an object changes with time, it means that the object is undergoing acceleration. However, whether the acceleration is uniform or non-uniform depends on how the velocity changes.
Uniform acceleration refers to a situation where the object's velocity changes by the same amount in every equal interval of time. In other words, the object's acceleration remains constant over time. For example, if an object's velocity increases by 10 meters per second (m/s) every second, it is undergoing uniform acceleration.
Non-uniform acceleration, on the other hand, refers to a situation where the object's velocity changes by varying amounts in equal intervals of time. In this case, the object's acceleration is not constant but may be changing. For example, if an object's velocity increases by 5 m/s in the first second, then by 10 m/s in the second second, and then by 15 m/s in the third second, it is undergoing non-uniform acceleration.
In summary, if an object's velocity changes with time, it indicates that the object is undergoing acceleration. Whether the acceleration is uniform or non-uniform depends on how the velocity changes over time.