Thank you for taking the time to read this. I am lay and will understand if the question is closed.
My understanding is that in a vacuum, a constant force of $n$ applied to an object of mass $m$, will cause the object to accelerate. However, at some point (relativistic) mass increases and I assume this affects inertia and therefore reduces acceleration.
My question is: Given a certain set of values for $m$ and $n$, would inertia and the applied force ever be in equilibrium, resulting in zero acceleration (constant velocity) or does the object continue to accelerate albeit at an ever decreasing rate?