A particle of charge +5.9 μC is released from rest at the point x = 86 cm on an x axis. The particle begins to move due to the presence of a charge Q that remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 40 cm if (a) Q = +75 μC and (b) Q = −75 μC? (a) Number Units (b) Number Units