An electron gun shoots electrons (q = e, m e = 9.1 10 31 kg) at
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An electron gun shoots electrons (q = −e, me = 9.1 × 10−31 kg) at a metal plate that is 4.0 mm away in vacuum. The plate is 5.0 V lower in potential than the gun. How fast must the electrons be moving as they leave the gun if they are to reach the plate?
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