A ball of mass 1g and charge 10^(-8) C m...

A ball of mass `1g` and charge `10^(-8) C` moves from a point `A`. Where potential is `600` volt to the point `B` where potential is zero. Velocity of the ball at the point `B` is `20 cm//s`. The velocity of the ball at the point `A` will be

`22.8 " cms"^(-1)`

`228 " cms"^(-1)`

`16.8 " ms"^(-1)`

`168 " ms"^(-1)`

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