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## Homework Statement

:[/B]One swings a rock at the end of a string. We wish for the string to remain taut and for the rock to travel in a circulat path, in a vertical plane. What mathematical condition must the centripetal acceleration of the rock satisfy for the string to remain taut when the rock is at its highest point?

## Homework Equations

:[/B][F[/c] = m[v][/2] / r ????

## The Attempt at a Solution

So far I come up with this equation to define what is going on but I am not sure

**[F[/c] = m[v][/2] / r ????**

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