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 S only
  • B Q only
  • C R only
  • D Q and S only
waec 2022physics

The correct answer is A. S only

A system is in neutral equilibrium if its equilibrium is independent of displacements from its original position. A marble S on a flat horizontal surface is an example.

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