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A block of mass 2 kg rests on an incline...

A block of mass 2 kg rests on an inclined plane which makes an angle of `30^(@)` with the horizontal. The coefficient of friction between the block and the surfcae is `sqrt(3//2)`. (i) What force should be applied on the block so that it moves down without any acceleration ? (ii) What force should be applied on the block so that it moves up without any acceleration ? (iii) Calculate the ratio of the powers in the above two cases if the block moves with uniform speed in both the cases.

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