第1章 枪道部的学霸主将
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“在水平的冰面上以大小为f=20n的水平推力，推着质m=60kg的冰车由静止开始运动。龙腾小说ltxsba.com◎，冰车受到的摩擦力是它对冰面压力的0.01倍，当冰车前进30m后撤去推力f，冰车又前进了一段距离后停止。撤去推力f时冰车的速度大小和运动总路程是多少？”
物理老师推了推眼镜，在看到没有人发言之后只能把目光放到了倒数第二排靠窗的位置：
“杨超，你来回答！”
“根据动能定理，物体动能的改变量等于合外力所做得功。根据题意，物体的质量是已知的且不会改变，所以只要计算出初状态和末状态速度即可列方程求解。”
“回答正确，不过为什么不使用牛顿第二定律呢，那样不是更加便于理解吗？”
物理老师笑眯眯地看着杨超，对于这个学生能够回答出这个问题他是一点都不惊讶。
“整个物体在变化的过程中分为两个状态，使用牛顿第二定律需要对存在推力f和不存在推力f两种情况分别进行受力分析，但是使用动能定理则是只需要考虑初末状态，不需要考虑中间过程。”
“回答正确，请坐！”
杨超刚一坐下，他的附近就响起了窃窃私语的声音。
“好厉害啊！”
“是啊，杨超同学真的好厉害！”
“我怎么就想不到呢？”
听到周围的赞叹声，杨超淡淡一笑，这种问题，但凡是个从中国来得学生，只要是稍稍认真学过物理的，解答起来都没有任何难度。毕竟，中国的基础教育远远走在世界前列。
他把目光放到窗外，那是学校的弓道部正在操场上进行户外练习，杨超目光一扫，就发现了那个熟悉的身影。
“叮铃铃！”
下课铃声响起。杨超马上被一群人给围住了。
“杨超同学，麻烦你教教我这道题怎么做吧？”
“杨超同学，这周末我们一起去图书馆复习吧？”
“杨超同学，要不今天晚上来我家吧？”
就在杨超被这群人吵得头昏脑胀。不得安宁的时候，有人出现及时救了他：“杨超，你到我办公室来一趟！”
看到是老师开口，同学们也就不再阻拦，放任他离开。
刚一进办公室。带着杨超来到办公室的老师就神色严肃地说道：“杨超，我觉得有些事情我们必须要沟通一下了。”
“说吧，什么事情？”
看到杨超表情平静，对方就急了：
“你怎么还这么淡定？我们来到这个副本已经三天了，但到现在为止这里只有我们四个人，其他人居然一点消息都没有！而且我们始终都没有收到系统关于主线任务的提醒，甚至，就连剧情都没有展开，你不觉得奇怪吗？”
“冷静一些，孔璋。”
杨超看了这个自己在很久之前就已经认识的轮回者一眼。缓缓说道。
“你叫我怎么冷静？剧情主线没有展开也就罢了，但是到现在为止，我们的人数少了一半啊！最重要的是我们和宫未央失去了联系！你别忘记我们是为什么来这个副本的。”
看着孔璋激动的模样，杨超微微皱起了眉头，从上个副本回来之后，由于经历了太多的事情，他的心态发生了根本性的转变，所以对于孔璋现在这种表现他稍稍有些反感。
反感归反感，不过对方毕竟是自己的盟友，杨超还是耐着性子说道：“即便你现在再着急也是于事无补。这个副本宫未央要，如果他发现和我们失去联系，自然会想办法来找我们。至于你说得任务，我想等到那些丧尸开始出现的时候系统就会发布了。”
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