Gravitational potential energy increases with height

Steps:

• Gravitational potential energy (GPE) is given by GPE = 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 h.
• Compare heights of chairs A, B, C, and D from the diagram.
• Chair A is at the greatest height.

Why A is correct:

• Chair A has the maximum h, so by GPE = mgh, it stores the most potential energy.

Why the others are wrong:

• B is lower than A, so less GPE.
• C is even lower, reducing GPE further.
• D is at the lowest position, with minimal GPE.

Final answer: A