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Two metal spheres, each of mass I g an...

Two metal spheres, each of mass I g and radius 5 mm, are placed on a smooth horizontal insulated surface. The separation between their centres is 15 cm. Now , one sphere is charged to a potential of 500 V and the other to 1000 V. What are the velocities of the balls when the distance between their centres becomes 30 cm due to repulsion?

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`0.21 cm*s^(-1)`, of each ball
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