A nice example of a rooler coaster modeled with GeoGebra through this link[br][url=http://dmentrard.free.fr/GEOGEBRA/Maths/export4.26/MontrusseMD.html?fbclid=IwAR2W7odS59o_mQgydLf28eUbyRaOBJZfrpJrmhy9DQDLTPQbUATNmeTYLQU]http://dmentrard.free.fr/…/Maths/export4.26/MontrusseMD.html[/url].