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Question

Total kinetic energy of solid sphere of mass m rolling with velocity v without slipping is

A
710mv2
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B
56mv2
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C
75mv2
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D
107mv2
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Solution

The correct option is A 710mv2
A rolling body has linear kinetic energy along with rotational kinetic energy.
K.ETrans=12mv2 , K.ERotational=12Iω2
Thus, total K.E of rolling body is
K.Etotal=K.ETrans+K.ERotationalK.Etotal=12mv2+12(25mr2ω2)
As we know that in rolling without slipping, velocity (v)=radius of sphere (r)×angular velocity (ω)v=r×ω ∴K.Etotal=710mv2

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