A Proton (Mass = 1

A proton (mass = 1.67 × 10−²⁷ kg, charge = 1.60 × 10−¹⁹ C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference V_B − V_A.

A) +15 V
B) −15 V
C) −33 V
D) +33 V
E) −20 V