A force of `98N` is just able to move a body of weight `45kg` on a rough horizontal surface What are the coefficient of friction and angle of friction ? .

Explanation

F=98N, `R=45 xx 9.8 =441N`
`mu^(2)=(F')/(R)=0.22`
Angle of friction `theta=tan^(-1) mu=tan^(-1)0.22=12^(@)24'`