2008 National Question 1 Single-choice Differentiating 2008_quanguo_old_i 1.(6分)如图所示,一物体自倾角为θ的固定斜面顶端沿水平方向抛出后落在斜面上。物体与斜面接触时速度与水平方向的夹角φ满足( ) A. tanφ=sinθB. tanφ=cosθC. tanφ=tanθD. tanφ=2tanθ Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →