The roller coaster car has a mass of 850 kg, including its passenger. It is released from rest at the top of the hill A.

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The roller coaster car has a mass of 850 kg, including its passenger. It is released from rest at the top of the hill A. Neglect friction, the mass of the wheels, and the size of the car. Take hB​=18 m,ρB​=9 m,hC​=14 m, and ρC​=7 m. (Figure 1) Figure
Determine the minimum height h of the hill crest so that the car travels around both inside the loops without leaving the track. Express your answer to three significant figures and include the appropriate units. Part B What is the normal reaction on the car when the it is at B ? Express your answer to three significant figures and include the appropriate units.
What is the normal reaction on the car when the it is at C ? Express your answer to three significant figures and include the appropriate units.