One end of the spring is attached to a nail O driven into the table, and the other to a weight B (Fig. 57). The load, sliding on the table without friction, makes circular movements with linear speed v around the nail. Find the radius of the circle along which the load moves if it is known that the length of the undeformed spring is 10 and doubles if a load B is suspended from the spring. Neglect the mass of the spring and assume that its elongation is directly proportional to the load.

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