Spinning stone on a string

Classical Mechanics Level pending

The maximum endurable tension force of a \( 1.2 \text{ m} \) long string is \( 151 \text{ N.} \) You tie a stone with mass \( 2 \text{ kg} \) to the end of the string and keep spinning it until the plane of rotation becomes parallel to the ground. If the string finally snaps, making the stone fly away, what is the speed of the stone at the moment that the string is cut loose?

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