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