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A wrecking ball swings at the end of a 11.4-m cable on a verticalcircular arc. The crane operator manages to give the ball a speedof 12.0 m/s as the ball passes through the lowest point of itsswing and then gives the ball no further assistance. Friction and air resistance are negligible. What speed vf does the ball have when the cable makes an angle of 26.9 ° with respect to the vertical?

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