4. The roof of a two-story house makes an angle of 30 degrees with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 5.0 m/s. The distance to the ground from that point is 7.0m. Determine the following: a. How long is the ball in the air? b. How far from the base of the house does the ball land? c. What angle does the velocity vector make with the horizontal the moment the ball hits the ground? d. Write the final velocity vector in ijk notation.