8. A proton (q = 1.6x10-19 C and m = 1.67x10-27 kg) initially moves left to right along the x-axis at a speed of 2000 m/s. It moves into an E-field that points in the -x direction. The proton travels a distance of 0.200 m before coming to rest. Determine the acceleration (in m/s2) of the proton in the E-field. A. 4x107 B. 3x107 C. 2x107 D. 1x107

8. A proton (q = 1.6x10-19 C and m = 1.67x10-27 kg) initially moves left to right along the x-axis at a speed of 2000 m/s. It moves into an E-field that points in the -x direction. The proton travels a distance of 0.200 m before coming to rest. Determine the acceleration (in m/s2) of the proton in the E-field. A. 4x107 B. 3x107 C. 2x107 D. 1x107