Correct answer only !

where on the diagram above would the roller coaster have the least amount of kinetic energy?

The roller coaster would have the least amount of kinetic energy at point A.

This is because kinetic energy is always at it's lowest when it is at the highest point. Point A is the highest point on the roller coaster, therefore, point A is where it's kinetic energy will be least.

I hope that helps u!

:)

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.