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(Can I get the answer with a lot of detail on how it's worked out?) A...

(Can I get the answer with a lot of detail on how it's worked out?)
A coin is moving in a horizontal circle in a cone. The cone has height 70 cm and radius 20 cm. The coin is at a height halfway up. The coefficient of static friction is 0.3. The mass of the coin is 5 g. How fast is the coin moving to stay at this height?If the velocity is halved what will the height of the coin be now?

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