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A roller coaster track is shaped like a semicircle with radius 30m. A 300kg cart is held at the top, then dropped. What is the

A roller coaster track is shaped like a semicircle with radius 30m. A 300kg cart is held at the top, then dropped. What is the normal force between the cart and the track when the cart is at the lowest point? Hint: start by finding how fast it is moving at that point

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