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A proton gun fires a proton from midway between two plates, A and B, which are...

A proton gun fires a proton from midway between two plates, A and B, which are separated by a distance of 11.7 cm; the proton initially moves at a speed of 123 km/s toward plate B. Plate A is kept at zero potential, and plate B at a potential of 693 V. With what speed will it hit plate A?

Answer is not 2.47*10^5 m/s. Please help. Thank you!

Science   Advanced-Physics   
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