突然有个要用华语来blog的感觉，不知为什么。知道我华语烂得要命，尽管笑我的错字或古古怪怪的language吧。连language 我也不知道叫什么，天啊 o.o是不是叫语文？

一个星期多没blog 了，不知写下什么，每天都是一样，上学，下课，回家，做功课，看电视，偶尔开电脑上msn。我的生活就是那么无聊的，不像韩国节目有这么drama的。

已经过了差不多４分钟了，我打字的速度超慢 -.-昨天放学后留下来看npcc和找东西玩。这句听起来怪怪的 ._.做了一点数学，刚才也做了一些，想待会儿应该能够完成吧。Mr teoh那天没来，给了我们三个revision exercise 来做，简直是有一点儿太多了吧。做了我看是四题左右，觉得sian掉了，便去看那些中一s和中二s。找不到中二，也找不到中一的，因为他们好像一直跑来跑去的，懒得跟在他门后面。年纪老了，跑了一点儿就会觉得累 :D

ncc他们ord了，过了不久，也将会是轮到我们。时间过得真快，一转眼，就要离开了。听起来好像是我要死了。他们的ord是超酷的，想那些观众也觉得一样。Yishuo太紧张了，忘记report.lololol.但是看了一半我觉得有一点闷了，所以找了别的事做，像跟chaohsien买水。Chaohsien也带了一个照相机，真巧，所以他拍了不少照片。到了结尾，sec4 squad 就唱了他们的ncc主打歌。Np也有一首相似的个，但是我总觉得他们的比我门的棒多了。

七点左右，到了金文泰的巴刹吃著名的福建面，卖了很多年了。等了好像半个小时多，面终于来了。吃完后就聊天，就回家了。上了网一下，觉得很累，就睡觉了。

和你门分享mr teoh帮我们derive 的 work done = change in kinetic energy.

F=ma

as we know a=dv/dt

F=m (dv/dt)= m(dv/dx . dx/dt) =>chain rule of differentiation

since velocity v= dv/dx where x is time,

F=mv . dv/dx

F dx= mv dv

integration of F w.r.t x with upper limit 1 and lower limit 0= integration of mv w.r.t v with upper limit 1 and lower limit 0.

jjjjjjj1jjjjjjjjjjjjjjjj2jjjj1

[Fx] = [ 1/2.mv ]

jjjjjjj0jjjjjjjjjjjjjjjjjjjjjj0

jjjjjjjjjjjjjjjjjjjjjjjjjj2jjjjjjjjjjjj2

Fx - Fx = 1/2mv - 1/2mv

jjjj1jjjjjjj0jjjjjjjjjj1jjjjjjjjjjjjj0

let 2 x's in Fx1-Fx0 = x

jjjjjjjjjjjjjjjjj2jjjjjjjjjjjjj2

Fx= 1/2mv - 1/2mv

jjjjjjjjjjjjjjjj1jjjjjjjjjjjjj0

thus, work done=change in kinetic energy.