Final answer:
An individual force does NOT do positive work upon an object if the object is moving at constant speed.
Step-by-step explanation:
An individual force does NOT do positive work upon an object if the object is moving at constant speed. This statement is true.
When an object is moving at a constant speed, there is no change in its kinetic energy. The net work done on an object is equal to the change in its kinetic energy. Since the kinetic energy remains constant during constant-speed motion, the net work done on the object is zero. Therefore, no individual force can do positive work on the object.