A 4-lb ball B is traveling around in a circle of radius r1 = 3 ft with a speed (vB) 1 = 6 ft/s. If the attached cord is pulled down through the hole with a constant speed vr = 2ft/s, determine the ball€™s speed at the instant r2 = 2 ft. How much work has to be done to pull down the cord? Neglect friction and the size of the ball.

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1 = 3 ft ("ah = 6 f/s v, =2 fus