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a copper penny(one minted before 1980) weights very close to 3 grams. model rocketteers used to cut plastic grocery bag to a certain size and strap a copper penny to it and time how long it took to fall to the earth. it was very accurate method of measureing height.

the point is, the old copper penny(not the new zinc core with a copper plating) were accurate. im sure you could find info on exactly how much a copper penny weighs....

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13y ago

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