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Question

Find the maximum force F to be applied for the system shown, so that the two blocks move together. Take g=10 m/s2.


A
1.5 N
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B
25 N
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C
5 N
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D
2.5 N
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Solution

The correct option is D 2.5 N
We know that in this type of cases the formula for the maximum force is,

Fmax=(μ2μ1)m2m1(m1+m2)g
=(0.20.1)×28×(8+2)10
=0.1×14×100=2.5 N

Hence the mximum force in this case is 2.5 N

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