Answer: This is an example of balanced forces.
Balanced forces occur when two or more forces acting on an object are equal in magnitude and opposite in direction. In this case, Sally is pushing the box to the right with a force of 25 N, while Billy is pushing the box to the left with an equal force of 25 N. Since the forces are equal in magnitude but opposite in direction, they cancel each other out. As a result, the net force on the box is zero.
To understand this concept better, imagine two people playing tug-of-war. If both individuals pull with the same amount of force in opposite directions, the rope will not move because the forces are balanced. Similarly, in this scenario, Sally's force pushing to the right and Billy's force pushing to the left balance each other out, resulting in no overall movement of the box.
It's important to note that balanced forces do not necessarily mean the object is at rest. The object could be in motion, but it will move at a constant speed in a straight line.
I hope this helps! Let me know if you have any further questions.
Step-by-step explanation: