A 2,315-kilogram roller coaster car starts at point A almost at rest. It first runs downhill and then is approaching a hill. At its top, the hill can be described by a circle with radius 9 m.
Find the height required at point A, such that the normal force acting on the car in point B is 64% of the weight.
Make sure to practise how to explain your work and also how to evaluate your result. Draw proper diagrams to support your work.
Below answer with the height.