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Q.

A block is in limiting equilibrium on a rough horizontal surface. If the net contact force is  2 times the normal force, the coefficient of static friction is

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a

12

b

1

c

13

d

0.5

answer is A.

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Detailed Solution

Fnet =N2+f2

2N=N2+μ2N2

2N2=N21+μ2

⇒2=μ2+1⇒μ2=1⇒μ=1

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