近年来在许多资料中常可看到如下一道力学问题:如图1所示,在水平面上固定一个半径为R的光滑球体,球的最高点有一质量为m的小物体。现在给小物体m一个水平初速度υ_0,使它做平抛运动,而不沿球面下滑,求υ_0的最小值和此时小物体落地点到抛出点的水 In recent years, the following mechanical problem can often be seen in many materials: As shown in Figure 1, a smooth sphere with a radius of R is fixed on the horizontal plane. The highest point of the sphere has a small mass with a mass of m. Now give the small object m a horizontal initial velocity υ_0, make it do a flat throw motion, and not slide down the sphere, find the minimum value of υ_0 and the point where the small object lands to the throwing point