rollercoaster designer had swell idea designing death defying cicular first drop rollercoast

a rollercoaster designer had the swell idea of designing a death-defying cicular first drop to a rollercoaster, hoping that the cars would plunge almost straight down before the curve at the bottom. what they found was that the cars would leave the tract and go flying like a projectile. at what angle does the car fly off the track?

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