问几道英语物理题.急.1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the trai

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问几道英语物理题.急.1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the trai
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问几道英语物理题.急.1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the trai
问几道英语物理题.急.
1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the train is moving at the end of this time.Illustrate the motion of the train with a velocity-time graph.
How long does the train take to cover the first half kilometre?
2.A train travelling at 55ms(-1次方)starts to accelerate,and 200 metres later she is riding at 7ms(-1次方),Find her acceleration,assumed constant.

问几道英语物理题.急.1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the trai
题目翻译过来应该是这样
1、一列火车以20米每秒的初速度开始以恒定的加速度加速,该火车在25秒内通过了1千米.运用公式s=ut+1/2at² 计算加速度.同时求火车在通过1千米时的末速度.用速度-时间图像表示火车的运动情况.
求火车通过前500所用的时间.
答：根据公式s=vt+1/2at² ,v=20,t=25,s=1000,解方程得到加速度a=8/5.
1km处的末速度vt=v+at=20+（8/5）*25=60
速度-时间图像没有画出,只需把握：匀变速运动的速度-时间图像为一直线,加速度为直线斜率,结合初速度和末速度以及时间,较易画出.
前500m所用时间,根据公式s=vt+1/2at² ,v=20,a=8/5,s=500,解方程得到t=[±25（根号5-1）]/2 取正数t≈25×0.618=15.45秒.
2、一列火车以55米每秒的初速度开始加速,经过200米后火车的速度为7米每秒,求加速度,假设加速度为一常数.
答：根据公式S=【vt的平方-v0的平方】/2a v0=55 vt=7 s=200 解得a=-7.44米每秒的平方.
可见火车是做匀减速运动.
你们这是搞双语教学吗?

问几道英语物理题.急.1.A train travelling at 20ms(-1次方),starts to accelerate with constant acceleration.It covers the next kilometre in 25 seconds.Use the equation s=ut+1/2at² to calculate the acceleration.Find also how fast the trai 外研社英语必修一 Module3 My first ride on a train 单词听力 急. 物理题急! 英语中by bike=on a bike还是in a bike by train =on a train还是in a train? 英语物理题 train英语怎么读 物理题!急!快!急!急! 1.we are planning to go to paris by train[用take a train的改] 请仿写下列英语句子,急···1.They are working hard__________________________ The train arrives late_________________________________ The boy tried again and again_________________________________2.We won the match________________________ Which goes [ ] (quick),a bus or a train?请各位姐姐哥哥添上去,[急] take a train 中文 初二英语作文 救救我吧 急1.请你用英语叙述一下你们正在谈论的暑假计划——想要去桂林...（提示词：talk about,plan,interesting,by plan,expensive,the train,faster ,first time,take,have a good time.)注意将来时 英语一道题目 很困惑He asked me if ____.A.the train will arrive lately B.the train always arrived lateC.the train would arrive lately D.the train always arrives on time 一道物理题,急 几道物理题,急, 物理题急求20 高一物理题 急! 物理题～急!非常感谢