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I used the formula a=v^2/r. I started off by trying to find v by using the formula v = squareroot of rg. So v=sqrt(1.0)(9.81). After finding v I used the formula T= 2 pi r/ v. I didn't get the right answer. I've looked through my book, and can't find an example similar to this. I don't know how to use the other info given to me, like knowing the circle was 1.6m above the ground and knowing that it landed 5.0m away.