Q4.A ball of mass m attached to one end of a thin, light, inextensible string moves with speed vo in acircle of radius ro in free space. Calculate the work required to reduce the radius from rotor bypulling the other end of the string through a smooth tube that is perpendicular to the plane of thecircle. Express the result in terms of m,vo, ro and r.(HINTS: 1) Tension in the string is a central force and therefore the angular momentum is conserved2) If radius changes then the speed changes, hence the KE. (Use work-energy theorem)See the representative figure given below:७o

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