A particle of charge +3.6 μC is released from rest at the point x = 69 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 15 cm if (a) Q = +29 μC and (b) Q = −29 μC? (a) Number Units (b) Number Units