A space shuttle is in orbit around the Earth. It travels at an unknown speed (v) at an orbital radius (r). The commander fires the engine and the speed doubles to 3v. What happens to the orbit if the centripetal acceleration stays the same?

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A space shuttle is in orbit around the Earth. It travels at an unknown speed (v) at an orbital radius (r). The commander fires the engine and the speed doubles to 3v. What happens to the orbit if the centripetal acceleration stays the same?