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除了重力和系统内的弹力,若其它力做功的代数和为零,则系统机械能守恒,它的表达式有三个:(1)E_1=E_2,系统初状态的总机械能等于
In addition to gravity and the elastic force in the system, if the algebraic sum of other power work is zero, the system mechanical energy is conserved. Its expression has three: (1) E_1=E_2, the total mechanical energy in the initial state of the system is equal to