(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img124.imageshack.us/img124/4485/clipboard01hb6.jpg [Broken]

2. Relevant equations

magnitude of n, u=1, u is in the direction of the velocityu=V/V

3. The attempt at a solution

The 1st part is easy, I wrote:

http://img129.imageshack.us/img129/1244/clipboard01mv3.jpg [Broken]

But I can't do the second part, I read about 10 different sources about these unit vectors, but now I'm even more confused. Especially about so called "radial" and "transverse" unit vectors, they are not "tangential" and "normal" unit vectors?

Anyway, for this part I tried analytical approach:

http://img129.imageshack.us/img129/7342/clipboard01tu6.jpg [Broken]

But not sure what to do next. Or another approach:

http://img129.imageshack.us/img129/287/clipboard02ve7.jpg [Broken]

Any help will be appreciated, I spent about 2 days on this problem alone

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# Homework Help: The unit tangent/normal vectors to motion+their derivatives

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