Hey everyone, I've been trying to do a problem in which I attempt to find the angle that maximizes the horizontal distance of a rocket, which has a stage with thrust and then a stage as a projectile. After a delay period, an ejection charge fires and causes the rocket to drop straight down. I want to have the ejection charge to fire before the rocket hits the ground, which means giving a bit of leeway. If any of you can look over my work and give me any suggestions, I would greatly appreciate it. 1. The problem statement, all variables and given/known data Thrust: 3.42 N Burn Time (constant thrust assumed): .33s Delay time before ejection charge fires after burn time: 1.74s Mass: .033893kg Other values are calculated in the spreadsheet. 2. Relevant equations Equations of motion/projectiles 3. The attempt at a solution See spreadsheet. In it, I attempted to use the goal seek function to set the total time since burnout equal to the delay time (1.74s) by changing the value of the angle. Thanks for any ideas!