How does acceleration change with time?
Acceleration is generally defined as this by SI standards:
or meters per second squared.
If velocity is measured like so:
and an object is travelling, let's say, 50 meters in 5 seconds, its velocity would be 10 meters per second.
Those same variables in acceleration would make it's value 2 meters per second squared. (or meters per second, per second). Meaning for every second that passes from 0 m/s to its end velocity, the object's speed increases by 2 m/s each second until it reaches 10 m/s, which takes 5 seconds.
The quicker the time, the greater the velocity increase per second.
The longer the time, the smaller the increase per second.