[单选题]
Starting from rest, a proton falls through a potentialguho6s3ksp y)-g 0ojm 1m4z0w difference of 1200n:ue nlb 9 ts;xfc4g3ey4r q25 V. What speed does it acqui 4se 9eql t :fr2b43guycnn5;xre?
A. $1.2 \times 10^{5} \; m/s$
B. $2.4 \times 10^{5} \; m/s$
C. $3.6 \times 10^{5} \; m/s$
D. $4.8 \times 10^{5} \; m/s$
