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A stone tied at the end of a string 80 c...

A stone tied at the end of a string 80 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 25 revolutions in 14 s, what is the magnitude of acceleration of the stone ?

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The correct Answer is:
`9.9 ms^(-2)`, in radial direction towards the centre at all points.
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