UPLAND - Chunks of pumpkin and smiling teenagers were a common sight Friday at Upland High School.
About 320 physics students participated in the annual pumpkin launch, where the students use their hand built trebuchets to launch pumpkins and other squashes across the soccer field to learn about energy.
This year's launch is Riley Malone's second.
Malone said she likes the trebuchet project because it's different than typical science projects.
"I love the annual launch day because ever since I saw my first trebuchet when I was a freshman, I have always been interested about how those machines worked and how they related to physics," she said.
Malone was able to help a group of friends with their trebuchet last year.
This year, Malone's group spent 10 hours building a 5-foot tall trebuchet with an 80-pound counterweight.
"We ran into a complication with the release mechanism, because the pin that we had got wasn't working like we thought it would, so we just settled with a different release mechanism that was much safer," she said.
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