Three charges are located on the corners of a square of side 1.5 m as shown below

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Three charges are located on the corners of a square of side 1.5 m as shown below. Consider a point P located a distance 3 m to the right of charge q3. Ignore the effects of gravity. The charges have the following values: q1 = 5 µC, q2 = 7 µC, and q3 = 11 µC. q2, q3, and P are on the same line. (a) Calculate the electric potential at point P, assuming the potential at infinity is 0. Another charge, q4 = -10 µC, is located very far to the right of point P and is released from rest. (b) How fast is the charge moving when it reaches point P? The mass of this new charge is 150 grams.
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How would I find the total energy of a charge when it reaches point p

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