Physics Question Please Help Ahhh

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<p>Ok so I have been trying to solve this problem for hours, and it just doesn't make sense to me. </p>

<p>If anyone wants to help me, the part I am struggling with is PART A of question 942---> <a href="http://www.dsusd.k12.ca.us/users/edwardw/waluskas/1994BAPrv.htm%5B/url%5D"&gt;http://www.dsusd.k12.ca.us/users/edwardw/waluskas/1994BAPrv.htm&lt;/a&gt;&lt;/p>

<p>Am I missing something? I tried setting force=centripetal force, and solving for v in variables...but can I actually do that?!?</p>

<p>ANY help would be muuuuuuch appreciated thanks! :)</p>

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<p>Conservation of energy:
Uinitial+Kinitial=Ufinal+Kfinal (U=potential energy, K=kinetic energy)</p>

<p>mgh=.5mv^2
h=R; v=sqrt(2gR)</p>

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<p>Thanks you're my HERRRRRRRRRRRRRRO!!!!!!!!!!!!!</p>

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<p>i hope you didn't seriously spend hours on that , not because that'd make you dumb but just because that would stink</p>