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【简答题】
四质点A，B，C，D在同一平面上运动。每一时刻，A速度总对准B，速度大小为常量u；B速度总对准C，速度大小同为u；C速度总对准D，速度大小同为u；D速度总对准A，速度大小同为u。某时刻，A，B，C，D恰好逆时针方向按序位于各边长为ι的正方形四个顶点上，试求此时A的加速度a和A的运动轨道在此位置的曲率半径ρ。
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