I need hlep with some questions related to work, and energy.(adsbygoogle = window.adsbygoogle || []).push({});

http://img246.imageshack.us/img246/8616/untitled1xn8.jpg [Broken]

I tried doing #8 and I got the answer [tex]\sqrt{9.8}[/tex] but I got the answer wrong.

http://img149.imageshack.us/img149/8269/untitled1df2.jpg [Broken]

I used this concept to solve number 8, but why did I get it wrong?

N = mv^2/R

mg = N

mg = mv^2/R

But why did I get teh answer wrong? Did I do it wrong?

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# Work and Enegry Questions

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