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[Diagram: Ball P sliding down a quadrant of a circle and colliding elastically with ball Q at rest. g = 10 m/s², radius = 20 cm] As per the given figure, a small ball P slides down the quadrant of a circle and hits the other ball Q of equal mass which is initially at rest. Neglecting the effect of friction and assume the collision to be elastic, the velocity of ball Q after collision will be :

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