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85.

A smooth sphere A is moving on a frictionless horizontal plane with angular speed ω and center of mass with velocity v . It collides elastically and head-on with an identical sphere B at rest. Neglect friction everywhere. After the collision, their angular speeds are ωA and ωB respectively. Then

(a)      ωA<ωB

(b)      ωA=ωB

(c)      ωA =ω

(d)     ω =ωB

Ans. c

(3)

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