1. The problem statement, all variables and given/known data A perfectly spherical ball is launched horizontally with a linear velocity of 9.9 m/s and an angular velocity (perpendicular to its trajectory) of 4.1 m/s. The ball's mass is 5.0g. (Diagram for explanation of coordinate system) http://img221.imageshack.us/img221/2341/dddlcv.png [Broken] Find the landing position of the ball (its y and z coordinates). b. If the rotational kinetic energy is increased by 10%, find the new landing position of the ball. 2. Relevant equations Rotational KE = .5Iw^2 For a perfectly spherical projectile, I = 2/5 (MR^2) Translational KE = .5mv^2 [PLAIN]http://www.sentynel.com/suvat.png [Broken] 3. The attempt at a solution For y coordinate, simply use v=x/t in x direction to find t - t=x/v=4.102/9.9=0.414s. then, since in the y direction u=0 and a=9.8m/s^2, s=ut+.5at^2=0.83m above the ground on the wall. I have no clue how to go about the z coordinate. Please help, someone.