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Carl Joseph Vonnoh IV works on his trebuchet "Sweet Trebuchet O' Mine" before participating in the 12th annual Physics Trebuchet Day at Boyd-Buchanan's David L. Boyd Field on Thursday, Oct. 19, in Chattanooga, Tenn. Nine teams of physics students from Boyd-Buchanan School used their trebuchet to launch softballs onto the football field.

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Photos: Trebuchet day at Boyd-Buchanan School

Nine teams of physics students from Boyd-Buchanan School used their trebuchet to launch softballs onto the football field.

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