A charge of +3.3 micro-Coulombs is placed in a capacitor without a dielectric. It starts from rest and accelerates toward the negative plate. After it has traveled 309.2 cm, it is moving at 7.2 x 103 m/s. What is the magnitude (absolute value) of the surface charge density on the sheets in C/m2 if the mass of the charge is 3.2 kg? This can be done using electric force and constant acceleration, however, try this using concepts of potential and potential energy.