Problem 2: The roller coaster car has a mass of 700 kg, including its passenger. If it is released from rest at the top of the hill A, determine the

minimum height h of the hill crest so that the cart ravels around both inside the loops without leaving the track. Neglect friction, the mass of the wheels, and the size of the car. What is the normal reaction on the car when the car is at B and when it is at C?