Practice question
Question
A particle in circular motion has a centripetal acceleration of 81m/s2 and radius 9m. What is its speed?
Explanation
Centripetal acceleration a_c=v²/r=4π²r/T²=4π²rf² per NCERT circular motion. Substituting r and frequency/period gives a_c value matching 27 m/s. Other options use incorrect r or f, so C is correct.
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