Which example indicates that forces acting on an object are balanced?

Question

Which example indicates that forces acting on an object are balanced? — Exam MCQ

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C. A book lying motionless on a shelf — The correct choice is A book lying motionless on a shelf. It follows from the relevant Newtonian mechanics, motion, work, energy, power or simple-machine relationship.

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A. A ball at rest begins to move

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B. A ball falling to the ground

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D. A car accelerating down a road

Which example indicates that forces acting on an object are balanced?

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