FormsofEnergy
日期：2011-09-20 09:27:00
来源：作文地带
好评：优秀英语作文
作文地带导读：Before the object is released, it has a certain amount of gravitational potential energy, but no kinetic energy. When it hits the ground, it has no gravitational potential energy, since h = 0, but it has a certain amount of ki...
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