质量为m的物体静止于倾角为θ的光�斜面底端用平行于斜面方�的恒力f作用于物体上使它沿斜面加速�上运动.当物体运动到斜面中点时撤出外力 Template




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tomski质量为m的物体静止于倾角为θ的光�斜面底端用平行于斜面方�的恒力f作用于物体上使它沿斜面加速�上运动.当物体运动到斜面中点时撤出外力 coloring