With only 1 dimension, you want to get to position X and stop there. you have a maximum acceleration A you can apply yourself; each frame you choose what direction to accelerate.
So if you have a velocity V, and want to stop at position X as fast as possible, how much of your maximum acceleration A do you apply yourself?
(If you are far away, you apply your maximum acceleration, but when you are close, you start braking. So based on your velocity and remaing distance, you need to decide when you begin to brake.)