ROLLER COASTER |variant of Giordano 5.25]: Consider a roller coaster. When it is at the bottom of its track the normal force on the roller coaster is three times its weight. The speed of the roller coaster is v PART A: Draw free body diagrams (ignoring friction) of the roller coaster when it is at the bottom and top of its track. PART B: What is the radius of curvature r of the track in terms of g and v? PART C: If the roller coaster has the same radius of curvature at the top of its track, and maintains the same speed v, how many times its weight is the normal reaction when it is at the top