A negatively charged particle of mass m= 1.17x10-24 kg and q = -3.20x10-19 C is immersed in a uniform 2.00 x 103 N/C electric field pointing in the negative x direction. The particle is initially traveling antiparallel to the uniform electric field at a speed of 2.00x104 m/s. Assume that the gravitational force acting on the particle is negligible compared to the electrostatic force acting on it. Consider a period of time during which the particle travels a distance of 100 mm antiparallel to the uniform electric field.