A Proton Initially Moves Left to Right Long the X

Multiple Choice

A proton initially moves left to right long the x axis at a speed of 2.00 × 10³ m/s.It moves into an electric field,which points in the negative x direction,and travels a distance of 0.300 m before coming to rest.If the proton's mass and charge are 1.67 × 10−²⁷ kg and 1.60 × 10−¹⁹ C,respectively,what is the magnitude of the electric field?

A) 13.9 N/C
B) 0.0696 N/C
C) 28.3 N/C
D) 0.104 N/C