Question

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

Answer 1

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.
Yes. It is possible for a body to move with a non-zero velocity even when the net zero external unbalanced force is acting upon it. Consider a body moving with a constant velocity. There is no external unbalanced force acting upon it. If the body continues to move with a constant velocity in the same direction, then it will continue to be in a state of motion. The only conditions are that it should move 

Answer 2

According to Newton's third law of Motion , No external force is needed to move an object with constant velocity. So, an Object travels with a constant velocity (non-Zero) When it experiences a net Zero external Unbalanced force. The magnitude of this velocity is constant and the direction is same as in the beginning.

An object may also not move at all if it experiences a net Zero external Unbalanced force. This is because , the object may be at rest in the beginning.