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A point charge of -12 micro-coulombs is fired directly towards a single infinite sheet of charge. It is initially moving at 3.4 m/s towards the sheet and after it has traveled 0.7 meters it is moving at 18.4 m/s. If the mass of this charge is 0.22 kg, and the weight force is ignored, what is the surface charge density (charge per area) of the sheet in micro-coulomb/m2? If the sheet is negatively charged, indicate so with a negative sign, but omit the sign if positive.

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