While filming a movie, a stunt double must step off the side of a building with a repelling cord (rope). The stunt double must free fall for a certain distance (loosely holding the cord), and then start decelerating (by tightly gripping the cord). The building is 27.8 m high, and the maximum deceleration the stunt double can reach is 1.25 m/s².

How far from the ground at the base of the building (in m) should the stunt double start decelerating in order to come to a complete stop just as they reach the ground?