Roller Scale A Man In The Roller Coaster Car Upside Down Is Sitting On A Bathroom Scale.?

A man in the roller coaster car upside down is sitting on a bathroom scale.? - roller scale

A man in the car of a roller coaster sits on a scale of Bath. While traveling s to 36.0 m /) s at sampling (in the upper circle of the head, the radius of the trail is 54 vertical feet, and the man has a mass kg of 49.2 with details on the Newton is the scale?

The question of when the underside of the roller coaster, I Equation
F = Fn = mg + Re ^ 2 / r + MV
also may be wrong ... I do not know yet.
For this question, I m = 55.2 kg, radius = 54 m and a speed of 40.6 m / s.
Is it fair that the equation? and I use the other question as well? or is it something that I need to change on it?