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Question

Find the minimum value of F for which the system is in equilibrium? [ Take g= 10 m/s2]


A
30 N
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B
10 N
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C
15 N
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D
20 N
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Solution

The correct option is A 30 N
By FBD of the blocks

As the system is in equilibrium and the 5 kg block will have the frictional force f in the backward direction as the block has the tendency to move forward

T=4g f=μmg
F+f=T 4g=F+0.2(5)g
F=4g0.2(5)g=30 N

Hence option A is the correct answer

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