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Q.

In the figure, the coefficient of friction between the floor and the block B is 0.1. The coefficient of friction between the block B and A is 0.2. The mass of B is m and the mass of A is m/2. The maximum horizontal force F that can be applied to the block B, so that both blocks move together is

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a

0.15 mg

b

0.25 mg

c

0.1 mg

d

0.45 mg

answer is D.

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Detailed Solution

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Acceelration of the system

a=Fμ2m1+m2gm1+m2

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maximum common acceleration

=f1maxm1=μ1g

F=μ1+μ2m1+m2g

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