At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 6.2 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 1.4 rev/s. Ignore air resistance and determine the number of revolutions she makes while on the way down. I am really stuck on this problem. What equation would I use?