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1. The problem statement, all variables and given/known data

Still working on the question I posted few days ago, here's the link for that question:

https://www.physicsforums.com/showthread.php?t=164889

I kinda got confident over my answer, but I discovered another formula, and it screwed up everything.

It is:

[tex]V_{1,f} = \frac{m_{1}-m_{2}}{m_{1}+m_{2}} v_{1,i} + \frac{2 * m_{1}}{m_{1}+m_{2}} v_{2,i} [/tex]

[tex]V_{2,f} = \frac{m_{1}-m_{2}}{m_{1}+m_{2}} v_{2,i} + \frac{2 * m_{1}}{m_{1}+m_{2}} v_{1,i} [/tex]

Hope, I put the tex code right. Anyhow, it gives me

[tex]x_{1,f}=-4.37[/tex]

[tex]x_{2,f}=10.03[/tex]

[tex]y_{1,f}=7.01[/tex]

[tex]y_{2,f}=4.48[/tex]

But using my that previous way(that relativity method) I get

[tex]x_{1,f}=-1.20[/tex]

[tex]x_{2,f}=9.40[/tex]

[tex]y_{1,f}=13.20[/tex]

[tex]y_{2,f}=5.85[/tex]

Now, I am confused over mine(I tried that applet, but it is pretty cumbersome

to set values.

Anyhow, if anyone can tell me which answer is right?

I would be really thankful. I have this thing due tomorrow

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# Homework Help: Need help

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