Physics-
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Question

Two blocks of Nass 8 text end text k g and 4 text end text k g ane connected a heavy string placed on rough horizontal plane, the 4 kg block is Pulled with a constant force F. The co-efficient of friction between the blocks and the ground is 0.5, what is the value of F, So that the tension in the spring is constant throughout during the motion of the blocks? open parentheses g equals 10 text end text m s to the power of negative 2 end exponent close parentheses

  1. 40 N    
  2. 60 N    
  3. 50 N    
  4. 30 N    

The correct answer is: 60 N

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