1. The problem statement, all variables and given/known data The original question is: A ball is shot horizontally off the edge of a cliff 35 m high. The ball lands 20 m from the base of the cliff. a. How long was the ball in the air? b. What was the initial velocity of the ball? 2. Relevant equations I believe these would be helpful. x - Δx = vt - (1/2)at^2 x - Δx = Vot + (1/2)at^2 3. The attempt at a solution To find time, I have this: 20 = 0t - (1/2)(-9.8)t^2 20 = 4.9t^2 t = 2.02 sec which I then plugged into the second equation to find Vo 20 = Vo (2.02) + (1/2)(-9.8)(2.02)^2 20 = 2.02 Vo - 20 40 = 2.02 Vo Vo = 19.802 m/s This unfortunately appears to be in error, but I am unsure where I went astray. I think it's something about the incorrect equations being used, or my not fully understanding the problem.