Question #2d0c0

1 Answer
Dec 4, 2017

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Please find my solution for (A), (B) and (C)
(D) The work done is negative, indicating that work is done against the electric force. Since the initial velocity of proton was not given it was assumed to start with zero kinetic energy. In that case external energy must have been supplied to move the proton from point A to point B. So it makes no sense to ask what is the proton speed.