Practice question
Question
An object in uniform circular motion has a radius of 5 m and completes 10 revolutions in 20 s. What is the magnitude of its centripetal acceleration?
Explanation
Centripetal acceleration a_c=v²/r=4π²r/T²=4π²rf² per NCERT circular motion. Substituting r and frequency/period gives a_c value matching 20 s. Other options use incorrect r or f, so A is correct.