High road low road race, potential kinetic energy Part 2--Homemade Science with Bruce Yeany

Updated video on the high road low road track race physics demonstration that I posted previously. In this video I tried to explore or clarify several suggestions and comments that viewers had in the first video. The high road low road track has been a classic demonstration for physics classrooms for years. Two tracks start at the same height and end at the same height,but... is the shortest distance between both ends the fastest route? How about if we add more hills for it to go up and down ? Several