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g 应是 9. 8 N kg，还是 9. 8 m s²？ - 知乎 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，从质量和加速度两个物理量一致性推导的。 要说9 8 N kg和9 8 m s²究竟有何差别，举一个例子就明白了。