While in empty space, an astronaut throws a ball at a velocity of 13 m/s. what will the velocity of the ball be after it has traveled 6 meters?

In empty space, there's nothing to exert force on the ball after it leaves
her hand.  It sails away in a straight line, at constant speed of 13 m/s. 
If it doesn't sail too close to a planet, a star, an asteroid, or a moon, it
may travel 6 billion light years and still be moving at 13 m/s.