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  5. 請問這題怎麽算
Physics
高中
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耘

請問這題怎麽算

例:一質點做直線運動,位置時間關係x(t)=2t²-6t-11(SI制)。求 (1) 2s~5s間平均速度、平均速率。 (2)1s~5s間平均速度、平均速率。
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