Gravitational potential energy is maximum at the highest point on the track

Steps:

• Gravitational potential energy (GPE) is given by GPE = mgh, where h is height above a reference point.
• The ball is released from the highest position, so compare heights of points A, B, C, D relative to the lowest point.
• Point A is at the maximum height, as it's the release position on the curved track.
• Thus, GPE is greatest at A, decreasing as the ball descends.

Why A is correct:

• GPE depends directly on height (from GPE = mgh); A is the highest point, maximizing h.

Why the others are wrong:

• B: Lower height than A, so lower GPE.
• C: Even lower than B, reducing GPE further.
• D: Lowest point, minimizing GPE.

Final answer: A