Problem: A small object, which has a charge q = 8.0C and mass m = 4.9 x 10-5 kg, is placed in a constant electric field. Starting from rest, the object accelerates to a speed of 2.8 x 103 m/s in a time of 1.2 s.
Part A: Determine the magnitude of the electric field.
Please show solution step by step with details.