An object experiences a 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.

Explanation : 

$\bullet$Yes, an object may travel with a non-zero velocity even when the net internal force on it is zero. 

$\bullet$An object moving in some direction with constant velocity will continue in it's state of motion as long as there are no external unbalanced forces acting on it. 

$\bullet$In order to change the motion of the object, some external unbalanced force must act upon it.

$\bullet$A raindrop falls down with a constant velocity. The weight of the drop is balanced by the up thrust and the velocity of air. The netforce on the drop is zero.