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Q.

Work done by friction on a rolling body in case of pure rolling (consider all cases which might possible)

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a

Is always positive 

b

Is always zero  

c

May be positive, negative or zero.

d

Is always negative 

answer is D.

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Detailed Solution

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If frame of reference changes, work will change 

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Work done by friction on a rolling body in case of pure rolling (consider all cases which might possible)