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In figure (i) surface is rough and net f...

In figure (i) surface is rough and net force on the block has magnitude `F_(1)` . In figure (ii) surface is smooth and net force on the block has magnitude `F_(2)`. In figure (iii) again surface is rough and net force has magnitude `F_(3)`. In cases (i) block is moving up and in cases (ii) and (iii) block is moving down. `[theta gt tan^(-1) (mu)` for (i) and (iii)] Then,

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