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在斜面上,重力 \vec g = (0, -mg) 投影到斜面方向 (costheta, -sintheta) 。沿平面分量 = 。
在斜面上,重力 \vec g = (0, -mg) 投影到斜面方向 (costheta, -sintheta) 。沿平面分量 = 。
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