The amount of potential energy depends on the objects and position velocity mass acceleration

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

Where should a carbon monoxide detector be mounted?