Question: An object is being rotated in the vertical plane with a rope of length 90cm by a circus man. And the object rotates 100 times

An object is being rotated in the vertical plane with a rope of length 90cm by a circus man. And the object rotates 100 times per minute. Suddenly the object's mass becomes 2/3 of the previous mass. So, the man increases the length of the rope. Suppose the number of rotations remains the same. Find the final length of the rope?

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