A roller coaster going down the first hill is an example of what type energy?

The roller coaster going down the first hill is an example of potential energy being converted into kinetic energy.

Potential energy is the energy stored in an object due to its position or condition. In this case, the roller coaster has potential energy because it is at a high point relative to the ground.

As the roller coaster goes down the hill, its potential energy is converted into kinetic energy, which is the energy of motion. The roller coaster gains speed as it goes down the hill, and this speed is due to the conversion of potential energy into kinetic energy.