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

A ball is tied to a light string L=1.39m . What is the minimum horizontal speed of the ball which will ensutre that the ball makes a full vertical circle?

2. Relevant equations

I still struggle how this answer is 8.25

3. The attempt at a solution

8.25 <-- this is correct answer from professor but I don't know how it became

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# Homework Help: Please help this problem!~

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