Work From Electric Force Practice Problems

A region of space has an electric field directed vertically upward. A point charge q = +12.0 × 10^-9 C is held at rest in the electric field. When freed, the charge travels upward. The kinetic energy of the charge is found to be +3.6 µJ when it has traveled a distance of 3.40 cm. Calculate the work done by the electric force.  

A stationary particle of charge +3.25 μC is located at the origin of an XY plane. The position of the second particle of charge -4.40 μC changes from (x,y) = (-8.50 cm, 0 cm) to (x,y) = (10.0 cm, 12.5 cm). Calculate the work done by the electric force on the second particle.