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g 应是 9. 8 N kg，还是 9. 8 m s²？ - 知乎 最后，回到原始问题，如果认为g代表重力加速度，严格说是地表自由落体运动的加速度，则g是9 8 m s²。 如果说g是地表物体受到的地球引力与其质量的比值，则 说它等于9 8 N kg的前提是——“牛顿”这个单位，是通过牛顿第二定律这一物理定律，从质量和加速度