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A wrecking ball swings at the end of a 10.0 meter cable on a vertical circular arc.

A wrecking ball swings at the end of a 10.0 meter cable on a vertical circular arc. The crane operator manages to give the ball a speed of 6 meters per second as the ball passes through the lowest point of its swing and gives it no further assistance. Air and friction are negligible. What speed vf does the ball have when the cable makes an angle of 30 degrees with respect to the vertical. Topic: Work and Energy.
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