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如图1所示,光滑水平面AB与半径为r的光滑圆弧BCD在B点相接.一质量为m的小球以速度v_0向右经过B点与以同样大小的速度向左经过B点时,加速度的值各为多少?
As shown in Fig. 1, the smooth horizontal plane AB and the smooth circular arc B with radius r are connected at point B. A ball with mass m passes through point B at speed v_0 to the right and passes point B to the left at the same speed. What is the value of acceleration?