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Questions  

A hoop rolls down on an inclined plane. The fraction of its kinetic energy that is associated with only the rotational motion is

a
1 : 2
b
1 : 3
c
1 : 4
d
2 : 3

detailed solution

Correct option is A

f = KErKEt+KEr= 12iω212mv2+12Iω2 = 12[ω = vR, I = mR2]

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