The velocity of a particle (m = 10 mg, q = -4.0 mC) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
a. 60 m/s
b. 20 m/s
c. 45 m/s
d. 40 m/s
e. 70 m/s
B
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