A spring (80 N/mN/m ) has an equilibrium length of 1.00 mm. The spring is compressed to a length of 0.50 mm and a mass of 1.9 kgkg is placed at its free end on a frictionless slope which makes an angle of 41 with respect to the horizontal. The spring is then released. (Figure 1)

Now the incline has a coefficient of kinetic friction kk. If the block, attached to the spring, is observed to stop just as it reaches the spring's equilibrium position, what is the coefficient of friction kk?Express your answer using two significant figures.