Roller coaster

We consider a roller coaster with a lift hill of height h = 30 m and a circular looping with radius R = 10 m. We assume, that the cars are only accelerated by gravity. If the cars start with zero velocity at point A, how large are the absolute values of the g-force in point B and C?

Additional question: A vertical g-force up to 5g is for the human body easily bearable. Can you modify the roller coaster, so that the maximal g-force is below this value (without removing the looping)?

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