一個不明數學的人

2碼 = 1.8288m(取至小數點後四位)

1.8288/0.3261
= 5.6081 m/s(取至小數點後四位)

5.6081*3.6
=30.1891 km/h(取至小數點後四位)

所以,時速大約係30公里



2011-05-07 11:52:45 補充：
回應下面果位兄台,首先,可能本人數學有d問題,謹此致歉。

其實我ge計法係用average speed黎計,其實係咪唔岩?

你話我用兩碼除1s,點可能會變m/s,其實我並冇用兩碼除1s,你睇清楚,我係先將單位轉換,碼變米,再除0.3261s

第二,你話我無lala乘3.6,係因為發問者要求ge單位係km/h,而唔係m/s,我physic未必好勁,但都知如果要將m/s轉做km/h係要乘3.6。

如本人ge解釋有任何錯,請指正。

I agree with sze hon using a simple mathematical equation to get the approximate speed in km/h. In mechanics, we have to consider gravity, air resistance, angle of trajectory etc.
5.6081 m/s
=5.6081 (m/1000m)*1km/(1s/3600s)*1hr
=5.6081*3.6 km/h
=30.1891 km/h<-------------correct

By physics *equation of motion
s=(u+v)t/2 s= 12 u=0 t=0.3261 v =?
12=0.3261v/2
24/0.3261=v
v=73.60(corr to 3 sig.fig)
therefore it is 73.6 m/s
It is just an example= = maybe wrong

2011-05-04 18:31:50 補充：
Your question isn't just only Mathematics but including Physics also

2011-05-04 18:33:51 補充：
上面位人兄真係唔知佢繼咩

2011-05-04 18:34:05 補充：
計not繼

2011-05-04 18:37:13 補充：
用兩碼除1s,點可能會變m/s
仲要冇lala times 3.6,funny