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Two particles A and B located at points ...

Two particles `A` and `B` located at points `(0,-10sqrt(3))` and `(0,0)` in `xy` plane. They start moving simultaneously at time `t=0` with constant velocities `vecV_(A)=5hatim//s` and `vecV_(B)=-5sqrt(3)hatjm//s`, respectively. Time when they are closest to each other is found to be `K//2` second. Find `K`. All distance are given in meter.

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