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A uniform sphere of mass m is positioned...

A uniform sphere of mass m is positioned between two horizontal planks `A` and `B` of mass `2m` and `m` respectively as shown. Ground surface is smooth and friction between planks and sphere is sufficient so that no slipping takes place. Horizontal forces `F_(1)` and `F_(2)` are applied on plank so that acceleration of sphere is zero. Plank `B` is moving toward right with acceleration a. Which of the following is/are correct ?

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