An alpha particle (m = 6.7 10-27 kg, q = +3.2 10-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops.

An alpha particle (m = 6.7 ´ 10-27 kg, q = +3.2 ´ 10-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA – VB.