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a block of mass m rests on a rough horizontal surface as shown in the figure . Coefficient of friction of friction between the block and surface is u . A force F=mg acting at angle Theta with the vertical side of the block pulls it . In which of the following cases can the block be pulled along the surface ?
Answer is cot theta/2 > u
Options were
• tan theta >u. • cot theta >u
• tan theta/2 >u. • cot theta /2 >u
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