2(ii)
Fill in the blanks :
(a) When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides ............... force necessary for circular motion.
(b) Work done by this force at any instant is ............... .
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(a) When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides centripetal force necessary for circular motion.
(b) Work done by this force at any instant is zero .