1.

A particle of mass `5kg` is moving on rough fixed inclined plane with constant velocity of `5m//s` as shown in the figure. Find the friction force acting on a body by plane. A. `25N`B. `20N`C. `30N`D. none of these

Answer» Correct Answer - A
`Sol. F_(k)=mu_(k)N=mu_(k) mg cos 30^(@)=mg sin 30^(@)`
`=5(10)((1)/(2))rArrf_(k)=25N`


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