Acar manufacturer claims that since their car engines dont get very hot, more of the gasolines energy can be used to make the car move. what law is related to this claim?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d