题目

Most people need to hear “I love you”. Once in a while, they hear them just   41   . I met Connie the day she was   42   to the hospice ward (病房) ,where I worked as a   43  . Her husband, Bill, stood nervous nearby as she was   44   to the hospital bed. While Connie was in the final   45  of her fight against cancer, she was   46  . Connie was a   47  . As we became acquainted , she confided (吐露) how   48   it was to be married 32 years to a man who often called her “a silly woman”. “I know Bill loves me. “she said.” But he has never b在水平光滑直导轨上，静止放着三个质量均为m＝1 kg的相同小球A、B、C.现让A球以v0＝2 m/s的速度向着B球运动，A、B两球碰撞后粘在一起，两球继续向右运动并跟C球碰撞，C球的最终速度vC＝1 m/s.求： (1)A、B两球跟C球相碰前的共同速度为多大？ (2)两次碰撞过程中一共损失了多少动能？