Studying the collision between rigid spherical shells and fixed rigid flat surface,the article educes the rational value range of k according to the law of conservation of energy by adding the ratio of tangential final velocity and tangential muzzle velocity of the collision point in the equation of kinetic energy loss,thus points out the reason why the kinetic energy loss in a collision is less than zero(Kane problem).%文章研究了刚性球壳与固定的刚性水平面的碰撞,在动能损失计算式中引入了碰撞点的切向末速度与切向初速度之比,根据能量守恒定律指出了合理的k值范围,从而指出了Kane难题即碰撞过程中的动能损失小于零的原因.
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