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Physics, 12.12.2020 15:50 dbenjamintheflash5

Work is NOT done by a person when she? pulls a sled across the ice covered backyard
lifts a book up off a desk
pushes on a desk to move it 3 m forward
pushes on a building

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Work is NOT done by a person when she? pulls a sled across the ice covered backyard
lifts a b...
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