题目

Note-taking is a skill that can help you do well in all your schoolwork. It can make you confident when you are studying. But unluckily, most students don’t know how to take notes. If your teacher writes notes on the blackboard, that’s great. You can copy them or write down the most important facts of all in class. Different teachers do things differently. For example, some teachers may focus on(关注) lots of dates and facts in class, but they only write the important ones on the blackboard. Other teachers may not write anything down, but they may repeat them. Don’t try to write down e质量为m1=2kg的带电绝缘球A，在光滑水平面上，从无限远处以初速度为10m/s，向另一个固定在水平面上带同号电荷的绝缘球B靠近B球的质量为m2=3kg，在他们相距到最近时总的动能为00J，他们具有的电势能为100100J．