Aroller coaster at an amusement park goes from the top of a tall hill to the bottom. during this time, the roller coaster

There are a couple of things happening while the coaster goes from the top of the hill to the bottom:

The coaster loses gravitational potential energy.The coaster's loss in potential energy becomes its gain in kinetic energy.The coaster's gain in kinetic energy causes it to speed up.Maybe the coaster is also losing some of its newly gained kinetic energy to friction due to contact between the coaster's internal components and air resistance.

Answerthe valence of an element or radical is equal to the number of positive or negative charges on the ion.