A block of mass 0.1 kg is kept on an inc...

A block of mass 0.1 kg is kept on an inclined plane whose angle of inclination can be varied from `theta = 30^(@)` to `theta = 90^(@)`. The coefficient of friction between the block & the inclined plane is `mu =1`. A force of constant magnitude `(1)/(2)mg` newton always acts on the block directed up the inclined plane and parallel to it. Then :

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