A ball (a) approaches two stationary balls (b and c) with a velocity vai=11.5m/s. It collided with ball b which in turn collided with ball c (w/c has a mass of mc=10.9kg). After the second collision, ball b is again stationary and ball c has a velocity of vcf=11.5m/s. Assuming the surface is frictionless and the collisions are elastic, what is the magnitude of the velocity of ball a (in m/s) after its collision with ball b?

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