A point charge with charge q1 is held stationary at the origin. A second point charge with charge q2 moves from the point (x1, 0) to the point (x2, y2).

How much work W is done by the electrostatic force on the moving point charge?

Express your answer in joules. Use k for Coulomb's constant (k=1/4(pi)(epsilon).

Any help will be greatly appreciated!