A sphere has to purely roll upwards. At an instant when the velocity of sphere is v, frictional force acting on it is
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a
downwards and μmgcosθ
b
downwards and 2mgsinθ7
c
upwards and μmgcosθ
d
upwards and 2mgsinθ7
answer is D.
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Detailed Solution
In case of rolling upwards in the inclined plane, let say friction acts upwardsTranslation : mgsinθ-f=ma Rotation : fR=25mR2aR For sphere, k2=25R2 From Eqs. (i) and (ii), f=27mgsinθ (upwards)