Each section of he sectional garage door travels through the curved section of track as the door opens. When the top roller of the section shown reaches the horizontal section of track the lower roller is still in the curved part.  If the acceleration of the top roller is 3.deltadeltadelatdelta in/s^2 horizontally to the right and velocity is 1delta.deltadeltadelta in/s to the right, what is the acceleration of the lower roller at that point and the angular acceleration of the segment?