1. The problem statement, all variables and given/known data A projectile is fired horizontally from a gun that is 99.0 m above flat ground, emerging from the gun at a speed of 250 m/s how long is it in the air? how far does it travel horizontally? vertical component of velocity as it strikes the ground? 2. Relevant equations 3. The attempt at a solution To find how long it is in the air for, I built a y position function: y = 99 + -4.9t^2 And solved for when y = 0 to get a t of 4.49 seconds. To find how far it traveled horizontally, I built an x position function: x = 250t And solved for when t = 4.49 seconds to get 1122.5 meters traveled horizontally. For the vertical component of velocity as it strikes the ground, I simply differentiated my y position formula and solved for t = 4.49 seconds, but this is incorrect. I'm not sure I fully understand what the "vertical component of velocity" is. Thanks.