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A stone tied to the end of string 80 cm ...

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

A

`680 cm/s^2`

B

`860 cm/s^2`

C

`720 cm/s^2``

D

`990 cm/s^2`

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