39.A solid sphere of mass 2 kg is pulled by a constant force acting at its centre on a rough surface having co-efficient of friction 0.5. The maximum value of F so that the sphere rolls without slipping is

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A solid sphere of mass ‘m’ and radius R rolls on a horizontal rough surface without slipping due to a horizontal force ‘F’ acting at the top of the sphere. Then the frictional force acting between the body and the surface is

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