particle is projected from the trolley with a velocity vi↖{\^}+2vj↖{\^}+vk↖{\^} relative to theground. x-y plane is horizontal. Trolley moves with a constant velocity 3vi↖{\^} for sometime and then starts moving towards + y axis with constant velocity. After some timethe particle drops into the trolley. The magnitude of the velocity of the trolley along yaxisis :

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