Equation for air time given velocity? 1. The problem statement, all variables and given/known data Given a certain velocity going straight up in a vacuum on Earth from y = 0 m, how long does a mass remain in the air? Create an equation. (So, for example, if you throw a baseball up at 20 m/second, how long will it take for it to fall back to your hand?) 2. Relevant equations Unsure...d = v*t + 1/2at^2? 3. The attempt at a solution I know that this should be really elementary, but I must be really sleep-deprived because I'm just not seeing how to extrapolate it from my standard kinematics equations. For the record, this isn't the whole question, just the part of a lab I'm hung up on...so please don't think I'm trying to get you guys to do my job for me.