$A$ heavy stone is tied to the end of a string and whirled in a horizontal circular path of radius $20 \, cm$ with a constant angular speed. If the centripetal acceleration is $980 \, cm \, s^{-2}$,what is its angular speed?
- A$7 \, rad \, s^{-1}$
- B$14 \, rad \, s^{-1}$
- C$21 \, rad \, s^{-1}$
- D$49 \, rad \, s^{-1}$
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