A small object with negative charge q = -5.0 x 10 -4 C is released from rest at point a and moves in the electric field produced by other charges. At point b the object has kinetic energy 0.12 J. If the electric potential at point a due to the other charges is 600 V, what is the electric potential at point b?
A) 360 V
B) 840 V
C) 120 V
D) 240 V
E) none of the above
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