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Two block A and Bmove along a semicircul...

Two block `A` and `B`move along a semicircular wire frame as shown in figure. The beads are connected by an inelastic string wich always remains tight . At an instant the speed of `A` is `u,/_BAC = 45^(@) and BOC = 75^(@)`,where `O` is the center of the semicircular are. The speed of bead `B` at that instant is

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