----Would you like to help me fetch some chalk? ----_______ A. It doesn’t matter B. No hurry. C. With pleasure. D. Why me? 答案:C如图所示,质量为M的小车静止在光滑的水平地面上,车上装有半径为R的半圆形光滑轨道。现将质量为m的小球放于半圆形轨道的边缘上,并由静止开始释放,当小球滑至半圆形轨道的最低点位置时,小车移动的距离为______________,小球的速度为_________