1. The problem statement, all variables and given/known data If the range of the projectile is 4.14 m, the time-of-flight is T = 0.854 s, and air resistance is negligible, determine the following. (Assume that the acceleration due to gravity has a magnitude of g = 9.80 m/s2.) (a) What is the launch angle of the projectile? (b) What is the initial speed of the projectile? 2. Relevant equations See below. 3. The attempt at a solution I don't even know where to start. The book I have has equations that require either the launch angle or the initial speed, so I have no idea how I could do this without knowing one or the other. I couldn't use any of them since I wasn't given either the launch angle or the initial speed. I guessed for a and b because I had no idea what to do. This is the first physics class that I have ever taken, so I have no previous experience with physics, which makes it very confusing for me.