A roller coaster stops at the top of a hill. What force brings the roller coaster back down to the ground?

Simple enough that it seems like a trick question: gravity.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.