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【简答题】
小滑块A位于光滑水平桌面上，小滑块B处于桌面上的光滑小槽中，两滑块的质量都是m，并用长为2l、不可伸长、无弹性的轻绳相连。开始时，A，B间的与小槽垂直且长为l如图2—15所示。B初始静止，现给滑块A以平行于槽的速度v0。求当B开始运动时B的瞬时速度的大小。
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