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Two particles (A and B) of masses m and ...

Two particles (A and B) of masses m and 2m are joined by a light rigid rod of length L. The system lies on a smooth horizontal table. The particle (A) of mass m is given a sharp impulse so that it acquires a velocity u perpendicular to the rod. Calculate maximum speed of particle B during subsequent motion. By what angle `theta` will the rod rotate by the time the speed of particle B become maximum for the first time ?

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