5.5 pt A -6.8 JC point charge has 69 J of kinetic energy when it is 1.2 cm away from a 3.4 /C point charge. At a later time, the - 6.8 (C charge is 9 cm away from the 3.4 uC charge. the 3.4 uC charge is fixed in place and cannot move. What is the change in electric potential energy of the two-charge system as the -6.8 (C moves from 1.2 cm to 9 cm? 12. A -69.0J B -15.0 J C-2.31 J D 231J E 15.0 J