A ball of mass m = 50 g, tied to the end of a thread of length l1 = 1 m, rotates with a frequency n1 = 1 s–1, resting on a horizontal plane. The thread shortens, bringing the ball closer to the axis to a distance l2 = 0.5 m. At what frequency n2 will the ball rotate? How much work A does the external force shorten the thread? Neglect the friction of the ball on the plane.
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