正文 第55章 不上讲台,全程口算(第2页/共2页)
们连题目都没看明白。
这运动员也是闲的蛋疼,就不能少推两次,非得推八次……
就在同学们接连放弃,坚持的人越来越少时,突然一道声音响起,夺走众人的注意力。
“bc”
苏云视线紧盯着黑板,淡然地说道。
罗立人眼神刹那间变得无比明亮,追问道:
“怎么得出的结论?”
所有人紧紧地盯着苏云,各种情绪在众人心中发酵。
苏云又作答了,这怎么可能!
这道题这么难,苏云是真的会?
而且这才多久,就做出来了?
更关键的是,苏云好像没计算吧,笔都没有动过,就静静地看了会儿题目而已。
光看就能做出来,别逗了,骗三岁小孩子呢!
苏云也没有让大家失望,他的反应又一次刷新了众人的认知,
“首先,设运动员和物块的的质量分别为m、m0,规定运动员运动的方向为正方向,……”
他还真开口了,同学们皆是一脸惊骇地看着苏云。
来真的啊……
突然,罗立人将苏云打断了,
“苏云,你上来,写到黑板上吧。”
罗立人也是好心,毕竟这道题还是有计算量的,不动笔写很难解答。
“不用了。”
苏云直接拒绝了,继续口算答题,其实已经心算过了一遍,
“运动员开始时静止,第一次将物块推出后,运动员和物块的速度大小分别为v1、v0,则根据动量守恒定律:
0=mv1-m0v0”
“解得
v1=(m0/m)v0”
“物块与弹性挡板撞击后,运动方向与运动员同向,当运动员再次推出物块
mv1+m0v0=mv2-m0v0”
“解得
v2=(3m0/m)v0”
“……”
上黑板写,那得多慢,还是读出来效率高。
苏云吐字清晰,读的又流利,每一个人都能听得很清楚。
刚开始大家还能听懂,可不出20秒,一大半同学已经迷糊了。
不是耳朵没跟上,是大脑跟不上,反应不过来。
再到后面,除了物理老师罗立人,也就班上为数不多的几个学霸,还能跟上苏云的思维。
口算,全程口算,完全不用打任何草稿。
这骇人听闻的一幕,深深地折服了在座的人。
以前哪曾看过这场面,1班的同学们今天算是开了眼、见了世面。
苏云,简直是恐怖……
“根据题意可知
v8=(15m0/m)v0>5m/s”ъìqυgΕtv.℃ǒΜ
“解得
m<60kg”
“……”
“综上所述,运动员的质量满足
52kg<m<60kg”
“故ad错误,bc正确,选bc。”
终于,苏云将整个解题过程都说了出来。
逻辑严密,一环扣着一环,堪称完美。
苏云话落,众人呆若木鸡!
https://www.3zmm.net/files/article/html/58218/58218163/25068596.html www.3zmm.net。三掌门手机版阅读网址:m.3zmm.net
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