Which point on the roller coaster's path represents the point where potential energy is at a maximum? *
Point A
Point B
Point C
Point D

Point A

Explanation: Gravitational potential energy is the energy that an object has because of its height and is equal to the object’s mass multiplied by it’s height multiplied by the gravitational constant (PE = mgh). Gravitational potential energy is greatest at the highest point of a roller coaster and least at the lowest point.

Wave is a disturbance in a medium that transmits the energy between the two points. The medium is the material that wave travels through like water, air or gas. As the wave propagate, they disturb the density of the medium.

The medium and the speed of wave has a direct relationship. The higher the density of the medium, the higher the speed and as the density of medium goes lower so as the speed of the wave. The speed of the wave depends on the density of the medium.
C. Medium