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A positive point charge q1 = +5.00×10−4 C is held at a fixed position. A small...

A positive point charge q1 = +5.00×10−4 C is held at a fixed position. A small object with mass 4.00×10−3 kg and charge q2 = −4.00×10−4 C is projected directly at q1. Ignore gravity. When q2 is 0.400 m away, its speed is 800 m/s. What is its speed when it is 0.200 mm from q1?

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