If a force of 40 N does 600 joules of work, then it must have been applied continuously through a distance of (600/40) = 15 meters .
We can't tell how far the object ultimately moved, because we don't know
what other forces may have been acting on it. If there were NO other forces,
then it just kept going, even after the 40-N force stopped, with the same
600 joules of kinetic energy that it got from the work that the force did.