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You have built an enormous spring-loaded Hot Wheels track that will propel a 50 gram toy car through a loop and launch it across the room. The spring constant is 800 N/m, the spring launcher has an initial springdisplacement of 5 cm. What is the maximum radius R of the loop such that the car moves around the loop without falling off at the top?

115_enormous spring-loaded Hot Wheels.jpg

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