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A small sphere, having a charge of 10^(-...

A small sphere, having a charge of `10^(-6)C` and a mass of 2g, moved from a point A to a point B. Potential at A is 36000 V and that at B is zero. If the velocity of the sphere at B be `10 m//s`, what was its velocity at A (in `m cdot s^(-1)`) ?

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