15 Points A roller coaster starts from rest at A, rolls down…

15 Points A roller coaster starts from rest at A, rolls down the track to B, travels along a vertical loop of 12 meter diameter, and travels down past point E.  Knowing that h = 20 m and P = 35 m.  Assuming no Energy is lost to friction, determine: (The radius is listed in Feet on the Diagram and the Diameter is listed in meters in the question text.  Make sure to use Meters in the solution) The force exerted by the seat on a 50 kg rider at B, D, and E. What is the minimum value of the radius of curvature at E if the roller coaster is not to leave the track at that point.