What exactly are you trying to calculate with this set-up? I feel like you have too many variables and not enough known values. The “Suggest Velocity” assumes you know where you want the projectile to start and end. The “Predict Path” will tell you the “path” a projectile under the influence of gravity will travel given a starting velocity and location. Do you have an end point identified? Do you have a start velocity you want? What exactly are we working with because these 2 nodes assume different things about the problem you’re trying to solve.