1. A 0.20kg ball with an initial velocity of (26i-1.6j)m/s collides with a vertical wall. The wall exerts a constant force of -175i N on the ball and the ball's final horizontal velocity component is -15i m/s. Find the final vertical velocity component of the ball. 2. I know how to find the total change in momentum of the ball and how long the ball was in contact with the wall, but i don't know how to find the vertical velocity component. 3.