A Proton with a Speed of 2 $10 ^ { 5 }$

Multiple Choice

A proton with a speed of 2.0 x $10 ^ { 5 }$ m/s accelerates through a potential difference and thereby increases its speed to 4.0 x $10 ^ { 5 }$ m/s.Through what magnitude potential difference did the proton accelerate? (e = 1.60 × 10^-19 C ,m_proton = 1.67 × 10^-27 kg)

A) 630 V
B) 210 V
C) 840 V
D) 1000 V
E) 100 V