自由落体
自由落体运动是指只受重力作用（弗存在空气阻力个理想状态）个均匀加速度运动过程。
运动过程中重力势能搭动能之和遵守机械能守恒定律。拉地球上相同位置搭相同高度，自由落体个加速度相同（侪是g），搭质量无关。
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