I am not sure how to approach the following question:

A baseball is thrown down a hill. This baseball has on-board sensors that can measure its velocities in both the x- and y- directions. The data show that the ball took off with an initial velocity in the y-direction of 4.0 m/s and had a final velocity in the y-direction of -5.8 m/s . How much lower was the ball when it landed compared to where it started?

I figured out the hang time (1.0 s) based on the V(fy) = v(iy) + at formula. However, how do I get the magnitude of displacement from this? I have the equation for x(max) with the sin and cos -- not going to type it here because I'm not sure how to do thetas and such...in any case, how do I find angle theta based on this information so I can solve the equation?