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Finding Average Velocity

A stone of ma...

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A stone of mass m, tied to the end of a string,is whirled areund in a horizontal circle.(Negleet the force due to gravity). The lengththe string is reduced gradually, keepingthe angular momentum of the stone about thecentre of the circle constant. If the tension inthe string is given by T- Ar^{}, where a is aconstant, r is, the instantaneous radius of thecircle, then the value of a n is

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