Pathfinder Impulse & Momentum BYU 23

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Three identical small discs rest on a frictionless horizontal floor. One of them is projected along the floor to successively collide elastically with the other two and thereafter to move in its original direction with half of its initial speed. Assume the floor in the x-y plane and initial velocity of the first disc u in the positive x-direction, find velocities of the other two discs after the collisions.

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