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【简答题】
如图所示,长为l的轻杆,两端各固定质量分别为 和 的小球,杆可绕水平光滑固定轴O在竖直面内转动,转轴O距两端分别为 和 .轻杆原来静止在竖直位置。今有一质量为 的小球,以水平速度 与杆下端小球 作对心碰撞,碰后以 的速度返回,试求碰撞后轻杆所获得的角速度。
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