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The roller coaster with no shoulder support has a radius of 20 m. Expecting the roller coaster cart to weight no more than 2000 kg

The roller coaster with no shoulder support has a radius of 20 m. Expecting the roller coaster cart to weight no more than 2000 kg including passengers. What is the minimum speed the cart must have at the top to prevent the passengers in a cart from not falling out at the top of the loop

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