A Proton (M = 1

A proton (m = 1.7 × 10−²⁷ kg, q = +1.6 × 10−¹⁹ C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference V_B − V_A.

A) +8.5 V
B) −8.5 V
C) −4.8 V
D) +4.8 V
E) −17 V