a block of mass 'M' is kept on a rough horizontal surface. The coefficient of static friction between the block and surface is 'u'. The block is to be pulled by applying a force to it. What minimum force is needed to slide the block ? in which direction should the force act?
plzz see the attachment....ignore the point of application of force of friction as it must be between the surfaces .ignore other small noticeable cut-marks too.
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at an angle 
to the block with respect to ground.
