1. The problem statement, all variables and given/known data "What is the initial velocity of a projectile" We did an experiment where we launched rockets and timed them from the time they were launched, to the time they hit the ground. Our "Problem" on the lab is to find the initial velocity. Here are the times we recorded with the first rocket: Trial 1: 4.38s and 4.5s Trial 2: 3.625s and the second stopwatch malfunctioned Trial 3: 3.69s and 3.82s Trial 4: 3.97s and 3.28s Trial 5: 3.81s and 3.81s Here are the times recoded with the second rocket: Trial 1: 5.35s and 5.31s Trial 2: 5.62s and 4.6s Trial 3: 5.18s and 4.6s Trial 4: 5.53s and 3.68s 2. Relevant equations I was thinking, to get velocity in general I could use v = at since we know the times and acceleration = 10m/s due to gravity. But the question asks for Initial velocity, and we don't know the final velocity, so therefore our other equations wouldn't work 3. The attempt at a solution v = (10)(change in times) *also, if for example, trial number 1 where i subtract 4.38-4.5 to get the change in time, would I write a negative time or just subtract 4.5-4.38?