题目

在竖直的井底，将一物块以11m/s的初速度竖直向上抛出，物体冲出井口再落回到井口时被人接住，在被人接住前1s内物体的位移是4m，位移方向向上，不计空气阻力，取g=10m/s2．求：                                    （1）物体从抛出点到被人接住所经历的时间；                                                              （2）竖直井的深度．                                       �假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号()，并在其下面写出该加的词。删除：把多余的词用(＼)划掉。修改：在错的词下画一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词；2. 只允许修改10处，多者（从第11处起）不计分。I like eating fruit and vegetables what are of great benefit to our healthy. Not only do they prevent us from falling into ill, but they help us lose weight. I used to hate vegetables, but follow the doctor’s advice, I gradually kicked the bad habit. Just as an old saying going, “An apple a day keeps the doctor away”. However, there are still many child disliking fruit and vegetables. On contrary, influenced by this or that kind of advertisement, many were crazy about junk food. Consequently, they become weaker and weaker instead of getting strong. In my opinion, we must take action to change them.