A small object is attached to a light string which passes through a hollow tube. The tube is held by one hand and the string by

A small object is attached to a light string which passes through a hollow tube. The tube is held by one hand and the string by the other. The object is stet into rotation in a circle of radius r₁ .The string is then pulled down,shortening the radius of the circle to r₂ .The ratio of the new kinetic energy to original kinetic energy is

A small object is attached to a light string which passes through a hollow tube. The tube is held by one hand and the string by the other.

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