train is travelling at a speed of 15m/s and slows down uniformly to 5m/s whileA train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while travelling a distance of 50m.(1)Find its acceleration in this time .(2) It travel before co

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train is travelling at a speed of 15m/s and slows down uniformly to 5m/s whileA train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while travelling a distance of 50m.(1)Find its acceleration in this time .(2) It travel before co
train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while
A train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while travelling a distance of 50m.
(1)Find its acceleration in this time .
(2) It travel before coming to rest assuming the same acceleration is________
可以只给这道题的翻译.

train is travelling at a speed of 15m/s and slows down uniformly to 5m/s whileA train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while travelling a distance of 50m.(1)Find its acceleration in this time .(2) It travel before co
一列火车以 15m/s 的速度行驶,以一定的加速度运动50m,速度变为5m/s
（1）求出此时加速度
（2）如果以此加速度继续运动,______能停下来
利用公式末速度的平方-初速度的平方=2as ∴a=（5^2-15^2）÷（2x50）=-2m/s^2
t=(vt-vo)/a=（0-5）/(-2)=2.5s
第二问不太确定.

一列火车以15m / s的速度做匀减速运动，当经过的距离为50m时，火车速度为5m/s
1.求这时火车加速度
2.不会啊，求大神

第2题，v=u+at
V=0,u=15,a=-2
t=（7.5)^1/2

对于第二问我的看法是：当它的恒定加速度为多少时，火车刚好停下。此时，已知条件中有用的为初始速度15m/s 行驶距离为50m 求其在行驶50m停下所需的加速度，为2.25m/s^2

Travelling by train is more relaxing than___. But travelling by train is quite d_____. Travelling by air is _____ than by train.(expensive) travelling by train is ----cheaperand------enjoyable than that by air I think that travelling by train is far(interesting) travelling by train is not the fastest but the l____dangerous Travelling by plane is more expensive than travelling by train 于它意思一样的句子 he is travelling by train和he is travel by train 有什么不同,请把这两句翻译过来 travelling by train is more comfortable than by air 这句话谁是主语?谓语宾语? Travelling by train is （the most） interesting. 对括号部分提问.如题 Frenchmen prefer travelling by train to travelling by plane.翻译 She was travelling on the train. He is _______on the 6 o'clock train on Friday evening.A travelling B travel C travels 连词成句 1.had,the,an,little,yesterday,boy,accident.2.travelling,cheaper,by air,is,by train,than train is travelling at a speed of 15m/s and slows down uniformly to 5m/s whileA train is travelling at a speed of 15m/s and slows down uniformly to 5m/s while travelling a distance of 50m.(1)Find its acceleration in this time .(2) It travel before co Travelling by air is ______ more expensive than by train even though the air tickets are on discounA.very B.a lot of C.many D.far travelling by train is much（）and( )enjoyable than a rushed trip A cheap,far more Bcheaper,farmore C cheaper,much D cheap,more(解析 There are many people go travelling by train.