Physics-
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Easy

Question

Two blocks A and B of masses 6 kg and 3kg rest on a smooth horizontal surface as shown in figure. If coefficient of friction between A and B is 0.4, the maximum horizontal force which can make them move without separation is...

  1. 72N    
  2. 40N    
  3. 36N    
  4. 20N    

The correct answer is: 36N


    Maximum frictional force on B is
    mu m subscript B end subscript g equals 0.4 cross times 3 cross times 10 equals 12 N
    Hence, maximum acceleration =fraction numerator 12 over denominator 3 end fraction equals 4ms-1
    Hence, maximum force
    F equals open parentheses m subscript A end subscript plus m subscript B end subscript close parentheses a equals open parentheses 6 plus 3 close parentheses 4 equals 36 N

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