How can a roller coaster have enough energy for the entire track if a motor is only used to get the cars to the top of the first hill?

Select one:

A. The cars are moving so quickly that their momentum allows them to complete the track

B. The coaster uses only the kinetic energy produced when the cars go down the first hill this provides enough energy to complete the track.

C. The coaster uses conversions between kinetic and potential energies to continue on the tracks

D. The weight of the back cars provide enough force to push all of the cars in front of them forward this motion pulls the back cars as well.