A small remote-control car with a mass of 1.58 moves at a constant speed of = 12.0 in a vertical circle inside a hollow metal cylinder that has a...

A small remote-control car with a mass of 1.58 moves at a constant speed of = 12.0 in a vertical circle inside a hollow metal cylinder that has a radius of 5.00 .What is the magnitude of the normal force exerted on the car by the walls of the cylinder at a) point A (at the bottom of the vertical circle)? b) point B (at the top of the vertical circle)?