A rollercoaster (no air resistance) of mass m starts from rest at height h and then slides down a frictionless track as shown in the figure

 A rollercoaster (no air resistance) of mass m starts from rest at height h and then slides down a frictionless track as shown in the figure. See Fig. 1. Use Newtonian approach. a. What is the force of the inclined track on the rollercoaster at the bottom (point A)? Express your answer in terms of radius R and height h. b. What is the velocity up of the rollercoaster at point B? Express your answer in terms of radius R and height h. c. How far away (x-direction) from point B does the rollercoaster land on level ground? It is sufficient to express your answer in terms of up and the height of point B over ground.