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A stone of mass m, tied to the end of a ...

A stone of mass m, tied to the end of a string, is. whirled around in a horizontal circle (neglect gravity). The length of the string is reduced gradually such that mvr = constant. Then, the tension in the string is given · by `T = Ar`'', where A is a constant and r is the instantaneous radius of the circle. Then, n is equal to:

A

`+ 2`

B

`- 2`

C

`+ 3`

D

`- 3`

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The correct Answer is:
D
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