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Three block A,Band C whose masses are m,...

Three block A,Band C whose masses are m,km and 4m respectively kept at rest on the horizontal smooth surface, as shown in the figure. The ball A is given velocity `v_(0)`, rightward and it collides with the ball B elastically. Then ball B callides elastically third ball C. For what value of k, does the third ball C receive the maximum speed ?

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