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Search: Posts Made By: sciencegirl2
Forum: Physics (Grades 6-8) 04-23-2006, 12:59 PM
Replies: 2
Views: 6,807
Posted By sciencegirl2
Red face submarines

i need help building a submarine that will float for 30 sec., then sink for 30 sec. and then float back up to the top with no help from anybody after you first put it in the water
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