Coefficient of kinetic friction and constant velocity

[archcos]

How to find the degree of inclination if there is only coefficient of kinetic of friction is given & a constant velocity?

the coefficient of kinetic friction between a wooden box and an inclined plane is 0.30. At what angle will the box slide with a constant velocity once set in motion?

 

[rock.freak667]

At constant velocity, the resultant force is zero.

So what are the forces acting on the box?