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物理公式g=mg g代表什么 m和g各代表什么？ g：重力，单位为牛顿（n）。 m：质量，单位为千克。 g：重力与质量的比值约是9.8n/kg。（重力加速度）物体由于地球的吸引而受到的力叫. Official gmail help center where you can find tips and tutorials on using gmail and other answers to frequently asked questions.