A small mass m, attached to one end of a spring with a negligible mass and an unstretched length L, executes vertical

Question

A small mass m, attached to one end of a spring with a negligible mass and an unstretched length L, executes vertical oscillation with angular frequency wo. When the mass is rotated with an angular speed w by holding the other end of the spring at a fixed point, the mass moves uniformly in a circular path in a horizontal plane. Then the increase in length of the spring during the rotation is:

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