1. The problem statement, all variables and given/known data In class we made rockets out of 2L bottles and launched them using pressurized water. The angle that ours went at was 50 degress. Height was 26m. Hangtime 5.18s acceleration 3.8m/s2 and the mass of the rocket was .52kg 2. Relevant equations I am trying to find the initial velocity of the rocket. vi=vf-at only problem with that is that I dont have the final velocity either. 3. The attempt at a solution I honostly have no idea where to start. I have no clue. Help please! Thanks!