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Negative charge Q=-2.0 mC and mass m=10.0 g moving to the east with velocity v=70.0 m/s...

Negative charge Q=-2.0 mC and mass m=10.0 g moving to the east with velocity v=70.0 m/s enters the region with uniform electric field E=200.0 N/C directed due east. How far into the region with electric field will it move before coming to momentarily stop? Give answer in meters.

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