Spock decides to measure the gravitational acceleration on the surface of his home planet, Vulcan. He does so by swinging a rock at the end of a massless cord in a vertical circle. In order to complete the full circle, Spock finds that the rock needs a minimum speed of 3.0 m/s at the top of the circle. If the radius of the circle is 1.0 m, what is the gravitational acceleration on the surface of Vulcan?" Im not sure which equation to use?

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