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A stone tied to the end of astring 80 c...

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

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The correct Answer is:
`9.9ms^(2)` , along the radius at every point towards the centre .
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