# equations of motion

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Can any one explain to me what the 2nd equation of motion is used for?

s=1/2(u+v)t

i can't find any examples were it is used

btw: this is AS edexcel maths

Thanks

Posted: 19-04-11 10:02 by Louis Graves

Well,

s= displacement/distance

u= initial velocity

v= final velocity

t= time

It is used to find any of these... And you use it in Newton's Laws of Motions, Forces...

Sorry, I take AS AQA maths soo... :P

Just trying to help..

Posted: 20-04-11 11:57 by Hanis94

you sort of answerd my question thanks, i am just a bit confused as to if there are any special situations when the equation has to be used, because there are other options most of the time that are easyer to use,

do you understand wwhat i mean?

Posted: 23-04-11 13:10 by Louis Graves

Yeah I get it. Usually we tend to use the other easier ones. But some situations force us to use just one equation. For example:

s = ut + 1/2at^2 has no 'v' in it. So if a question does not provide 'v', you'll be forced to use this specific equation. It's the same with the other ones.

s = vt - 1/2at^2 doesn't have 'u'

v = u + at doesn't have 's'

And so on. Does that help?

Posted: 23-04-11 16:02 by Hanis94

yeh it does, thanks alot

Posted: 25-04-11 09:01 by Louis Graves

i hate you all

Posted: 27-04-11 11:14 by emily

emily that is really nasty. i reckon this girl has issues, she should see a councellor.

Posted: 27-04-11 11:31 by SARAH

Or she could have been expressing her hate for maths. :)

Posted: 27-04-11 13:18 by Hanis94