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Two blocks of Nass 8 kg and 4 kg and connected a heavy string placed on rough horizontal plane,  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? (g=10ms-2)

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

    Answer:The correct answer is: 60 N

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