A body of mass 10 kg lies on a rough horizontal surface. When a horizontal force of F newtons acts on it, it gets an acceleration of 5 m/s 2 . And when the horizontal force is doubled, it gets an acceleration of 18 m/s 2 . The coefficient of friction between the body and the horizontal surface is- (Take g = 10 m/s 2 )
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The resultant force on the body when force F is applied and the force of friction is f and its acceleration is 
is given by 
?(i) Similarly, if the acceleration is 
and the applied force on the body is doubled IF and force of friction is f, then resultant force on the body is given by 
Solving Eqs. (i) and (ii) 
Also, the force of friction 
(where 
is the coefficient offriction) or 
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