The force exerted by an electric charge at the origin on a charged particle at a point (x, y, z) with position vector r = x, y, z is f(r) = kr/|r|3 where k is a constant. find the work done as the particle moves along a straight line from (4, 0, 0) to (4, 2, 3).

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i just did this and got a 100.

not too sure thinking all accelerations are pointed down