A proton with a speed of 5.0 × 105 m/s falls through a potential difference V a

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A proton with a speed of 5.0 × 105 m/s falls through a potential difference V a

A proton with a speed of 5.0 × 105 m/s falls through a potential difference V and thereby increases its speed to 8.0 × 105 m/s. Through what potential difference did the proton fall?
A) 2000 V
B) 1300 V
C) 3300 V
D) 4600 V
E) 660 V

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