A 4.0-kg block slides down an inclined plane that makes an angle of 25° with the horizontal. Starting from rest, the block slides a distance of 2.5 m in 5.4 s. Find the coefficient of kinetic friction between the block and plane.

Answer 1

d=1/2 a t^2
solve for a, then
net force down plane=mass*acceleration
4*9.8*cosTheta-4*9.8*sinTheta*mu=m*a

solve for mu.