A particle with a charge of -1.8 μC and a mass of 1.6 x 10 -6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 64 m/s. The only force acting on the particle is the electric force. What is the potential difference VB – VA between A and B? If VB is greater than VA, then give the answer as a positive number. If VB is less than VA, then give the answer as a negative number.