A particle (mass = 6.7 × 10?27 kg, charge = 3.2 × 10?19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
A. 2.0 kN/C
B. 1.5 kN/C
C. 1.2 kN/C
D. 3.5 kN/C
E. 2.4 kN/C
Answer: C
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