光滑水平面有两个物块A、B在同一直线上相向运动，A的速度为4m/s，质量为2kg，B的速度为2m/s，二者碰后粘在一起沿A原来的方向运动，且速度大小变为1m/s．求B的质量及这一过程产生的内能．

单词拼写

小题1:To keep safe, everyone    __     to wear a seat belt in the car now. (tell)

小题2:---Do you know the places of interest in Wuxi ?

--Yes, it is the second time I ___________ the beautiful city. (visit )

小题3:To do this would be to cut the foot to fit the shoe. ( cut )

小题4:---What's the terrible noise?  ---The neighbours _____________  for the party. (prepare)

小题5:The little girl thought that her decision ___________ her future study in college and her future job as well. (affect)

小题6:The sports meeting they were looking forward to __________ yesterday. ( hold)

小题7:— Where were you last night?

— I was in the library. I ___________ some information on the Internet. (search)

小题8:My wife advised ___________ to the south,but I couldn’t take her advice. (move)