Question

practice it! which of the following accurately describes what is happening at point a, as seen in the image given kinetic energy is being stored. potential energy is changing to kinetic energy. potential energy is being stored. kinetic energy is changing into potential.

Explanation:

At point A of a roller - coaster, the roller - coaster is at a certain height. Potential energy is given by \(U = mgh\) (where \(m\) is mass, \(g\) is acceleration due to gravity, and \(h\) is height). As the roller - coaster moves down from point A (assuming it starts to move), the height \(h\) decreases and the speed \(v\) (related to kinetic energy \(K=\frac{1}{2}mv^{2}\)) increases. So, potential energy is changing to kinetic energy.

Answer:

Potential energy is changing to kinetic energy.