A point mass is tied to one end of a cord whose other end passes through a vertical hollow tube, caught in one hand. The point mass is being rotated in a horizontal circle of radius 2m with speed of 4 m/s. The cord is then pulled down so that the radius of the circle reduces to 1m. The ratio of kinetic energies under the final and initial state is

A point mass is tied to one end of a cord whose other end passes throu

1.	A point mass is tied to one end of a cord whose other end passes through a vertical hollow tube, caught in one hand. The point mass is being rotated in a horizontal circle of radius 2m with speed of 4 m/s. The cord is then pulled down so that the radius of the circle reduces to 1m. The ratio of kinetic energies under the final and initial state is
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