The change in velocity divided by time
The answer is: acceleration.
Dividing velocity by time is an important concept in physics, known as acceleration.
Acceleration is a vector quantity and is defined as the rate of change of a body's velocity.
This can be measured in meters per second (m/s) and acceleration is calculated by taking the change in velocity divided by the time it takes for that change to occur.
Acceleration is important to understand because it helps explain how things move and behave, and it can help us predict the motion of things.