If an unbalanced force does not act on an object in motion, it will keep moving at the same velocity forever. The term "velocity" refers to both speed and direction, so if there is no unbalanced force acting on the object, its speed and direction will remain constant.
If an object is already in motion and no unbalanced force acts on it, its speed or direction will not change. Newton's First Law of Motion states that an object in motion will continue moving at a constant velocity unless acted upon by an external force. Therefore, the object will keep moving at the same velocity forever.
To answer this question, it's important to understand Newton's first law of motion. According to this law, an object in motion will continue moving in a straight line with a constant velocity if no external force acts upon it. In other words, if an unbalanced force does not act on the object, it will keep moving at the same velocity forever. Thus, the correct answer is: it will keep moving at the same velocity forever.
