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NEET Exam Model Paper 4

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Question : 100

Total: 180

A ring of radius R is first rotated with an angular velocity W0 and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is µ.the time after which its angular spee is reduced to half is

ω0µR
2g
ω0R
2µg
2µ0R
µg
ω0R
2µg

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