Electric Potential energy, work, and kinetic energy?

Question

THere is an electric field of 3.73 x 10^14 N/C. What is the work needed to move a +0.10 microcoulomb charge from X to an infinite distance away and give it 0.02 J of kinetic energy?

Answer 1

Work needed equal to potential energy in the beginning and equal to kinetic energy at the end.

Answer 2

E.K.=1/2mv^2 In this formula m is the mass of the object moving with a velocity v. if it is an electron whose charge is 1.6 x10^-19 C, which is moving with a velocity v, in this formula you should use only the mass of the electron which is 9.1x10^-31 kg, There are separate formulae to find the energy using charges ======================================...