Задача id10471

A point charge of -10 µC is fixed in the gravitational field, and below it at a distance of 5 m there is a particle with a mass of 9 g and a charge of 4 µC. What minimum vertical speed must be imparted to the particle in order for it to reach the fixed charge? k = 9*109 m/F, g = 10m/s2.

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