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1. You can swing a ball on a string in a vertical circle if you swing...

1. You can swing a ball on a string in a vertical circle if you swing it fast enough. But if you swing too slowly, the string

1. You can swing a ball on a string in a vertical circle if you swing it fast enough. But if you swing too slowly, the string goes slack as the ball nears the top. Explain why there's a minimum speed to keep the ball moving in a circle.
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