Gravitational potential energy increases with height

Steps:

• Gravitational potential energy (GPE) is given by mgh, where m is mass, g is gravity, and h is height above a reference point.
• All chairs have equal mass, so GPE depends only on height.
• Compare heights of chairs A, B, C, D from the diagram.
• Chair A is at the greatest height, so it has the most GPE.

Why A is correct:

• A is highest, maximizing h in mgh formula.

Why the others are wrong:

• B is lower than A, reducing h.
• C is even lower, further reducing h.
• D is lowest, minimizing h.

Final answer: A