An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes,state the conditions that must be placed on the magnitude and direction of the velocity. If no,provide a reason.

(N/A) Yes. According to Newton's First Law of Motion,an object will continue to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.
If the net external unbalanced force is zero,the object will maintain its state of motion.
Therefore,if the object is already moving with a non-zero velocity,it will continue to move with the same constant velocity (i.e.,constant magnitude and constant direction) in a straight line.
Thus,it is possible for an object to travel with a non-zero velocity under zero net external force,provided the velocity remains constant in both magnitude and direction.