θ = angle of the incline surface from the horizontal surface = 25⁰
μ = Coefficient of friction = 0.15
m = mass of the person = 65 kg
[tex]f_{k}[/tex] = kinetic frictional force acting on the person as he slides down
mg = weight of the person acting in down direction
[tex]F_{n}[/tex] = normal force by the incline surface on the person
the free body diagram showing the forces acting on the person is given as
