4.如图所示为健身用的“�步机 .质量为m的运动�踩在与水平面成α角的静止皮带上运动�用力�后蹬皮带.皮带运动过程中受到阻力恒为ff使皮带 Template




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tomski4.如图所示为健身用的“�步机 .质量为m的运动�踩在与水平面成α角的静止皮带上运动�用力�后蹬皮带.皮带运动过程中受到阻力恒为ff使皮带 coloring