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Two smooth spherical non-conducting shel...

Two smooth spherical non-conducting shells `A` and `B` each of radius `R` ,having uniformly distributed charge `Q` and `-Q` on their surfaces are released from rest on a smooth non- conducting surface,when distance between their centre is 10R.The mass of `A` is `m` and that of `B` is `2m` .What is the speed of A just before it collides with B?

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