A particle with a charge of 4.20 nC is in a uniform electric field E directed to the left. It is released from rest and moves to the left; after it has moved 6.00 cm, its kinetic energy is found to be 1.50 X 10-6 J.
(a) What work was done by the electric force?
(b) What is the potential of the starting point with respect to the end point?
(c) What is the magnitude of E?