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when released from rest at point A, an unknown ion moves to point B. At point...

when released from rest at point A, an unknown ion moves to point B. At point B, its kinetic energy is 15eV. If the values of the potential at the two points are Va=0 and Vb=7.5V which of the following could be the unknown ion?

A) a copper atom which has gained two extra electrons

B) a copper atom which has gained one extra electron

C) a copper atom which has lost two electrons

D) a copper atom which has lost one electron

explanations/ equations would be most helpful! please and thank you :)  

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