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**What is the speed of the rock?**

I thought i was doing this right...but I guess not

Fspring = Fcent.

Fcent = m* v^2/r so.... v = sqrt(F*r/m)

v = sqrt(640*7.5/3 ) = 41 m/s

If anyone could tell me what I'm doing wrong, that would be alot of help!!! thanks! :-)