Problem: Four charges are fixed at the corners of a square centered at the origin as follows:   q at (−a, +a); 2q at (+a, +a); −3q at (+a, −a); and 6q at (−a, −a). A fifth charge +q with mass m is placed at the origin and released from rest. Find the speed when it is a great distance from the origin.

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Four charges are fixed at the corners of a square centered at the origin as follows:   q at (−a, +a); 2q at (+a, +a); −3q at (+a, −a); and 6q at (−a, −a). A fifth charge +q with mass m is placed at the origin and released from rest. Find the speed when it is a great distance from the origin.

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