HRWP19p77

You start with an initial height (think position vector) and an initial velocity vector. You have other information, such as the acceleration due to gravity of g = -9.8 m/s^2 (jhat). You can solve the vertical equation using just the (jhat) components of the acceleration and initial velocity (and initial height). See the second equation on your AP formula sheet (mechanics) if you need a reminder of how this goes. After part a, figure out how long till the ball hits the ground and you can solve the horizontal equation (the (ihat) part).