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  5. 求解國三理化
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求解國三理化

2.) 2.右圖(一)為5公斤物體所受作用力與桌面間 摩擦力的關係,若對此靜止物體施水平力20 牛頓,如右圖(二)所示,試問2秒內,摩擦 力對物體作為多少焦耳? (A)-20 (B)-40 (C)-60 (D)-80。 力15 N 10 F=20N 作用力(N) 圖(一)
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