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1) Can the work done by the force of kinetic friction on an object ever be positive? If yes, give an example. If no, explain

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1) Can the work done by the force of kinetic friction on an object ever be positive? If "yes," give an example. If \"no," explain why I 2) Can the work done by the force of Earth's gravity on an object ever be positive? If \"yes\" give an example. If \"no,\" explain why

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