1.

A block of mass 1 kg is at rest on a horizontal table. The coefficient of static friction between the block and the table is 0.5. The magnitude of the force acting upwards at an angle of \[60{}^\circ \] from the horizontal that will just start the block moving is

A. \[5\,N\]            
B. \[\frac{20}{2+\sqrt{3}}N\]
C. \[\frac{20}{2-\sqrt{3}}N\]         
D. \[10\,N\]
Answer» C. \[\frac{20}{2-\sqrt{3}}N\]         


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