Moving troubles

A box started moving from a horizontal plane onto a fixed wedge with an initial velocity of $18.9ms^{-1}$ .

After reaching to its end, it jumped from the wedge with a certain velocity. Another identical wedge was placed in front of it placed so that the ball just lands on it perfectly.

After the box moved over the whole wedge it finally came to rest. If the height of the wedge is $3.2m$ and it's angle of inclination is $\dfrac{\pi}{6}rad$ .

Find the kinetic coefficient of friction of the wedge and distance between the two wedges, if they are $\mu,R\blue{m}$ respectively submit ${R}+\mu$ assuming $g=9.8ms^{-2}$