Roller Coaster: Task 2- Video Clip 2

I learned that on a roller coaster, all the kinetic energy u need is all there by the time you reach the bottom of the first hill. The only thing is that the rest of the loops and hills and turns have to be lower than the first in order for the roller coaster ride to continue without stopping. If that was the case then the ride would come to an end very shortly, without making it back to the starting point.