Suppose three identical steel balls Q, R, and S, are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in neutral equilibrium?
A body is in neutral equilibrium when, upon receiving a slight displacement, it tends to come to rest in its new position, e.g., a ball rolling on a horizontal surface, or a cone resting on its curved surface.
Ball R: Positioned in a trough between two crests. If displaced slightly, it will move to a new position and remain there, showing it is in neutral equilibrium
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