Making endless runner main character(addimpulse or addforce)

I need some suggestion making the main character of an endless runner I am making.

Its a simple object not a skeletal mesh a static mesh would its moving on the ground endlessly. But it has some physics interactions.

I plan on extending from the Pawn class and adding a force to it every frame.

But I am confused which to addimpulse or addforce it tick.

I don’t to keep it accelerating. But when it slows down, it should make up the speed.