Question

kinetic energy is being stored. potential energy is being stored. potential energy is changing to kinetic energy.

Explanation:

Step1: Analyze kinetic and potential energy

Kinetic energy (\(KE=\frac{1}{2}mv^{2}\)) depends on motion (\(v\)), potential energy (\(PE = mgh\)) depends on height (\(h\)). At point \(A\) (top of the loop), the roller - coaster car is momentarily at rest (low \(v\)) but at a high height (\(h\)).

Step2: Determine energy type

Since \(v\approx0\) (so \(KE\approx0\)) and \(h\) is large, potential energy is being stored (as \(PE=mgh\) is large here). Kinetic energy is not being stored (as \(KE\) is related to motion). And since \(KE\) is not increasing (car is at rest at the top - most point of the loop), potential energy is not changing to kinetic energy at this exact point \(A\).

Answer:

Potential energy is being stored.