Particle a (Mass = M, Charge = Q) and B

Multiple Choice

Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 μC, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?

A) 8.6 J
B) 3.8 J
C) 6.0 J
D) 2.2 J
E) 4.3 J