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例 1 一个质量为ｍ的物体自距地面高为ｈ的塔顶上自由落下 ,问该物体落到地面的速度是多大 ?(不考虑空气阻力 )解析 假定地球的质量为Ｍ ,不考虑地球的公转和自转 ,因为物体是在地球表面附近运动 ,可以认为物体与地球间的万有引力即为ｍｇ .选定地球水平表面为参考平面 ,则从
Example 1 An object of mass m falls freely from the top of a tower with a height h from the ground, and asks how much the object falls to the ground? (Avoid air resistance) Analyze that the mass of the Earth is assumed to be M, regardless of the Earth’s For revolution and rotation, because the object is moving around the surface of the earth, it can be considered that the universal gravitation between the object and the earth is mg. If the horizontal surface of the earth is selected as the reference plane, then