What are two ways engineers use their understanding of kinetic energy and potential energy to make their designs better/ safer?

On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. Traditionally, the coaster cars are pulled up the first hill by a chain; as the cars climb, they gain potential energy.

answer: electrons

double the distance = divide strength by 4