f.1 maths ( in english)

👨🏻‍🏫 學術台數學

[匿名]

2008-08-21 6:19 am

大題目寫住..(many of these may be taken oralling)

問題:::: A train is moving with a speed of 45 km an hour. What are the speeds relative to this train of others moving in the same direction at 62km an hour and at 27 km an hour; also of one at rest?

我想問佢依條問題..想問咩?
同要計算過程.....(冇既話..咁就唔要..)

更新1:

最重要..我想問..... speeds relative 係咩? 可吾可解釋一下..?

回答 (2)

Barry

2008-08-21 7:30 am

✔ 最佳答案

有架火車以時速每小時 45 公里行緊.

o甘佢與一架以時速 62 公里及相同方向行駛o既火車o既相對速度係幾多??

ANS: 62-45 = 17

o甘佢與一架以時速 27 公里及相同方向行駛o既火車o既相對速度係幾多??

ANS: 45-27 = 18

o甘佢與一架靜止o既火車o既相對速度係幾多??

ANS: 45-0 = 45

2008-08-20 23:31:35 補充：
speeds relative ==> 相對o既速度

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john

2008-08-26 7:19 am

speeds relative to this train的意思係,假切你坐在這火車上觀察(量度),其他野的速度係d咩呢?
同你在平地上度係唔同的

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