A person brings a mass of 1 kg from infinity to a point A. Initially, the mass at rest but it moves at a speed of 3 m/s as it reaches A. The work done by the person on the mass is -5.5 J. The gravitational potential at A is
(a) -1 J/kg
(b) -4.5 J/kg
(c) -5.5 J/kg
(d) -10 J/kg