Final answer:
The moment of inertia is considered wrong with a merry-go-round, particularly when the children are positioned close to the axis or at the outer edge.
Step-by-step explanation:
In a merry-go-round, what is considered wrong is the moment of inertia. The moment of inertia is determined by the distribution of mass and the radius of rotation. If the children on the merry-go-round are closer to the axis, the moment of inertia decreases, which means it takes less force to start or stop the rotation of the merry-go-round. On the other hand, if the children stand at the outer edge, the moment of inertia increases, requiring more force to change the rotation.