1. The problem statement, all variables and given/known data Delta d = 0, v1 = 5.2 m/s, a = 9.8m/s^2 (down) delta t = ? 2. Relevant equations d = v1 x t + 1/2 x a x t^2 3. The attempt at a solution 0 = (5.2 m/s) x t + 1/2 x (9.8 m/s^2) x t^2 0 = t(5.2m/s - 4.9 m/s^2 x t^2) This is a sample question and states the answer is delta t = 0 or 1.1s. The problem is they don't show how they came with that answer. Could someone show how to get the final answer step by step....I emailed my online ilc support but never got an answer.