题目

如图所示，B物体的质量是A物体质量的1/2，在不计摩擦阻力的情况下，A物体自H高处由静止开始下落．以地面为参考平面，当物体A的动能与其势能相等时，物体距地面的高度是( ) A．H                      B．H                       C．H                D．H 答案：B_______, he came straight to his sick mother.     A. On his arrival　　　　　　    B. When he would arrive        C. As soon as he reached　　　　 D. Upon he got there