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[" 4.A small steel ball "A" is suspended...

[" 4.A small steel ball "A" is suspended by an inextensible thread of length "],[ell=1.5" from "" O.Another identical ball is thrown vertically downwards "],[" such that its surface remains just in contact with thread during "],[" downward motion and collides elastically with the suspended ball.If "],[" the suspended ball just completes vertical circle after collision,"],[" calculate the velocity of the falling ball just before collision."],[(g=10ms^(-2))]

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