Collision with diagonal surface

Ok, I'm having a bit of a problem with this.

A ball is dropping in free fall (not spinning/rotating or anything).
After a given time it collides with a diagonal surface (a total inelastic collision), it then begins to roll down from it.

How do I find the velocity that it begins to roll down the diagonal surface with? Do I just regard the ball's velocity as a vector and find the component that is parallel to the surface?

Need: -How long was it falling for?
      -Was it being accelerated or falling at constant velocity?
      -Angle of inclination of the diagonal surface with respect  
       to the horizontal, or the angle the vector of the free fall
       velocity with respect to the diagonal.

Then you would just use superposition to find the resultant velocity vector