A 1.5-kg collar can slide on a horizontal rod which is free to rotate about a vertical shaft. The collar is initially held at A by a cord attached to the shaft. As the rod rotates at a rate θ = 18 rad/s, the cord is cut and the collar moves out along the rod and strikes the stop at B without rebounding. Neglecting friction and the mass of the rod, determine the magnitude of the impulse of the force exerted by the stop on the collar.

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150 mm- 500 mm B