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  • 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...

    The of Friction Forms Kinetic

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