Concept:A body is in stable equilibrium if it returns to its original position after a small displacement.
Explanation:When a body is slightly displaced, its centre of gravity rises in stable equilibrium.
Gravity then pulls the body back to its original position.
A ball in the middle of a hemispherical bowl shows this behaviour.
If the ball is pushed a little, it rolls back to the lowest point.
Therefore, this is stable equilibrium.
A ball on an inverted hemisphere bowl is in unstable equilibrium because it rolls away.
A ball on a smooth horizontal table is in neutral equilibrium because it stays at the new position.
Walking on a tight-rope is also an example of unstable equilibrium.
So the correct statement describes a ball in the middle of a hemispherical bowl.
Answer:D. ball in the middle of a hemispherical bowl