Re: speed distance & time

[Hubert Lam <hubert@imap4.com>]

<==MeČ==> got bored on Mon, 15 May 2000 20:25:59 +1000 and so wrote the following:
 
          i am just writing to ask about a mathematical formula.
          i am trying to work out how fast an object travels and the other part (i
          think if its done backwards it tells you how long it took), but im not to
          sure how it goes i know that Speed Time and Distance is involved.
          
v = s/t

where v is velocity (or speed if you don't care about direction)
s is displacement (or distance if you don't care about direction)
and t is time.

from this you can derive the following:

v = u + at

where a is the acceleration of the object 
v is the final velocity
and u is the initial velocity

and hence you have 

v^2 = u^2 + 2as

and s = ut + 0.5a(t^2)

All you need to know is three of the variables and find the relevant equation of motion and plug
(substitute) the numbers into the correct places.