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Dtpt212
2 năm trước
người công nhân dùng 1 mặt phẳng nghiêng dài 8m để nâng 1 vật nặng 42kg lên cao 2m a)tính công nâng vật lên theo phương thẳng đứng b)Tính hiệu suất của mặt phẳng nghiêng biết rằng lực ma sát cản trở chuyển động của vật trên mặt phẳng nghiêng là 9N
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