Question

38. A proton initially moves left to right long the ´‑axis at a speed of 2 ´ 103 m/s. It moves into an electric field, which points in the negative ´ direction, and travels a distance of 0.2 m before coming to rest. If the proton's mass and charge are 1.67 ´ 10‑27 kg and 1.6 ´ 10‑19 C respectively, what is the magnitude of the electric field?

a. 28.3 N/C
b. 13.9 N/C
c. 0.104 N/C
d. 0.038 N/C

Answer 1

Force=Eq
E= Force/q=massproton*acceleration/q
you can get acceleration from the previous post.