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Two block of mass 4 kg and 2 kg are connected by a heavy string and placed on rough horizontal plane. The 2 kg block is pulled with a constant force F. The coefficient of friction between the blocks and the ground is 0.5. What is the value of F so that tension in the string is constant throughout during the motion of the blocks ? (g=10m/s²)

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30 N

60 N

40 N

50 N

answer is B.

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Detailed Solution

For a = 0, tension is constant throughout.

So, F must be the sum of the frictional forces, $f = μ (m_{1} + m_{2}) g = 0.5 (4 + 2) 10 = 30 N$

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