Final answer:
The net force on an object subjected to two forces of 4N and 10N depends on their relative direction. It can range from 6N, if they are opposite, to 14N, if they're in the same direction, thus the net force cannot be 5N.
Step-by-step explanation:
The question involves understanding the principles of vector addition in physics, specifically in relation to net force on an object when two forces are applied. The net force acting on an object when two forces, of magnitude 4N and 10N, are applied depends on the relative direction of the forces. If the forces are applied in the same direction, the net force will be their sum, 14N. If they are applied in opposite directions, the net force will be the difference, 6N. Intermediate net force values are possible if the forces are applied at an angle to each other.
The statement "The net force acting on the object cannot have a magnitude equal to 10N" is false because, if the forces act in the same direction, the net force equals the sum of the individual forces, which could be 14N. Likewise, a net force of 5N is not possible because the smallest net force achievable with 4N and 10N in opposite directions is 6N. A net force with the same direction as the 10N force is possible, depending on the angle of application of the 4N force. Finally, the net force must not necessarily be greater than 10N; it depends on how the forces are applied relative to each other.
Therefore, the correct answer is: The net force acting on the object cannot have a magnitude equal to 5N.