A disk A of radius r moving on perfectly smooth surface at a speed v undergoes an elastic collision with an identical stationary disk B. Find the velocity of the disk B after collision if the impact parameter is r/2 as shown in the figure

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Impact parameter r /2 : sin θ = 2 r r /2 ​ = 4 1 ​ , cos θ = 4 15 ​ ​ . Equal masses, elastic: B takes the line-of-centres component: v B ​ = v cos θ = 4 15 ​ ​ v Ans. (A)

Physics - Center of Mass Question with Solution | TestHub

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