A person brings a mass of 1 kg from infinity to a point A. Initially the mass was at rest but it moves at a speed of 2 m/s as it reaches A. The work done by the person on the mass is —3 J. The potential at A is
(a) —3 J/kg
(b) —2 J/kg
(c) —5 J/kg
(d) none of these.
