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Two charged particle A and B repel each ...

Two charged particle A and B repel each other by a force `k/r^2` where is a constant and r is th separation between them. The particle A is clamped to a fixed point in the lab and the particle B which has a mass m, is released from rest with asn initial separartion `r_0` form A. Find the change in the potential energyof hte wo particle system as the separation increases to a large value. What will be the speed o the particle b in this situation?

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