1. The problem statement, all variables and given/known data I'm taking grade 12 U physics and I'm having a really difficult time understanding the answers given compared to the answers I arrive at. For example: The question reads: A rock was thrown horizontally from a 25.0 m high cliff and landed 15.0 m from the base of the cliff. Determine the initial speed with which the rock was thrown, as well as its final velocity. 2. The attempt at a solution Vertical V1y = 0.0 m/s ay=9.8 m/s^2 Displacement = 25 m Solve for y-component 25m = (0.0 m/s)(change in time) + 1/2(9.8 m/s^2)(change in time)^2 Rearrange (change in time)^2 = 2(25)/9.8m/s^2 change in time = Sqrt 2(25) / 9.8m/s^2 change in time = 0.7215375318230077 This is the answer I arrived at. My workbook however, says the answer is 2.26. Can someone please explain to me how my workbook arrived that that answer? I cannot move on in the question until I solve this. So far every example in my course provides the correct calculations but all of the final answers are completely incorrect.